The United Nations was born of the belief that the people of the world can live their lives, raise their families, and resolve their differences peacefully. And yet we know that in too many parts of the world, this ideal remains an abstraction. We can either accept that outcome as inevitable, and tolerate constant and crippling conflict. Or we can recognize that the yearning for peace is universal, and reassert our resolve to end conflicts around the world.

That effort must begin with an unshakeable determination that the murder of innocent men, women and children will never be tolerated. On this, there can be no dispute. The violent extremists who promote conflict by distorting faith have discredited and isolated themselves. They offer nothing but hatred and destruction. In confronting them, America will forge lasting partnerships to target terrorists, share intelligence, coordinate law enforcement, and protect our people. We will permit no safe-haven for al Qaeda to launch attacks from Afghanistan or any other nation. We will stand by our friends on the front lines, as we and many nations will do in pledging support for the Pakistani people tomorrow. And we will pursue positive engagement that builds bridges among faiths, and new partnerships for opportunity.

But our efforts to promote peace cannot be limited to defeating violent extremists. For the most powerful weapon in our arsenal is the hope of human beings - the belief that the future belongs to those who build, not destroy; the confidence that conflicts can end, and a new day begin.

That is why we will strengthen our support for effective peacekeeping, while energizing our efforts to prevent conflicts before they take hold. We will pursue a lasting peace in Sudan through support for the people of Darfur, and the implementation of the Comprehensive Peace Agreement, so that we secure the peace that the Sudanese people deserve. And in countries ravaged by violence - from Haiti to Congo to East Timor - we will work with the UN and other partners to support an enduring peace.

I will also continue to seek a just and lasting peace between Israel, Palestine, and the Arab world. Yesterday, I had a constructive meeting with Prime Minister Netanyahu and President Abbas. We have made some progress. Palestinians have strengthened their efforts on security. Israelis have facilitated greater freedom of movement for the Palestinians. As a result of these efforts by both sides, the economy in the West Bank has begun to grow. But more progress is needed. We continue to call on Palestinians to end incitement against Israel, and we continue to emphasize that America does not accept the legitimacy of continued Israeli settlements.

The time has come to re-launch negotiations - without preconditions - that address the permanent-status issues: security for Israelis and Palestinians; borders, refugees and Jerusalem. The goal is clear: two states living side by side in peace and security - a Jewish State of Israel, with true security for all Israelis; and a viable, independent Palestinian state with contiguous territory that ends the occupation that began in 1967, and realizes the potential of the Palestinian people. As we pursue this goal, we will also pursue peace between Israel and Lebanon, Israel and Syria, and a broader peace between Israel and its many neighbors. In pursuit of that goal, we will develop regional initiatives with multilateral participation, alongside bilateral negotiations.

I am not naïve. I know this will be difficult. But all of us must decide whether we are serious about peace, or whether we only lend it lip-service. To break the old patterns - to break the cycle of insecurity and despair - all of us must say publicly what we would acknowledge in private. The United States does Israel no favors when we fail to couple an unwavering commitment to its security with an insistence that Israel respect the legitimate claims and rights of the Palestinians. And nations within this body do the Palestinians no favors when they choose vitriolic attacks over a constructive willingness to recognize Israel's legitimacy, and its right to exist in peace and security.

We must remember that the greatest price of this conflict is not paid by us. It is paid by the Israeli girl in Sderot who closes her eyes in fear that a rocket will take her life in the night. It is paid by the Palestinian boy in Gaza who has no clean water and no country to call his own. These are God's children. And after all of the politics and all of the posturing, this is about the right of every human being to live with dignity and security. That is a lesson embedded in the three great faiths that call one small slice of Earth the Holy Land. And that is why - even though there will be setbacks, and false starts, and tough days - I will not waiver in my pursuit of peace.

Third, we must recognize that in the 21st century, there will be no peace unless we make take responsibility for the preservation of our planet.

The danger posed by climate change cannot be denied, and our responsibility to meet it must not be deferred. If we continue down our current course, every member of this Assembly will see irreversible changes within their borders. Our efforts to end conflicts will be eclipsed by wars over refugees and resources. Development will be devastated by drought and famine. Land that human beings have lived on for millennia will disappear. Future generations will look back and wonder why we refused to act - why we failed to pass on intact the environment that was our inheritance.

That is why the days when America dragged its feet on this issue are over. We will move forward with investments to transform our energy economy, while providing incentives to make clean energy the profitable kind of energy. We will press ahead with deep cuts in emissions to reach the goals that we set for 2020, and eventually 2050. We will continue to promote renewable energy and efficiency - and share new technologies - with countries around the world. And we will seize every opportunity for progress to address this threat in a cooperative effort with the whole world.

Those wealthy nations that did so much to damage the environment in the 20th century must accept our obligation to lead. But responsibility does not end there. While we must acknowledge the need for differentiated responses, any effort to curb carbon emissions must include the fast-growing carbon emitters who can do more to reduce their air pollution without inhibiting growth. And any effort that fails to help the poorest nations both adapt to the problems that climate change has already wrought - and travel a path of clean development - will not work.

It is hard to change something as fundamental as how we use energy. It's even harder to do so in the midst of a global recession. Certainly, it will be tempting to sit back and wait for others to move first. But we cannot make this journey unless we all move forward together. As we head into Copenhagen, let us resolve to focus on what each of us can do for the sake of our common future.

This leads me to the final pillar that must fortify our future: a global economy that advances opportunity for all people.

The world is still recovering from the worst economic crisis since the Great Depression. In America, we see the engine of growth beginning to churn, yet many still struggle to find a job or pay their bills. Across the globe, we find promising signs, yet little certainty about what lies ahead. And far too many people in far too many places live through the daily crises that challenge our common humanity - the despair of an empty stomach; the thirst brought on by dwindling water; the injustice of a child dying from a treatable disease, or a mother losing her life as she gives birth.

In Pittsburgh, we will work with the world's largest economies to chart a course for growth that is balanced and sustained. That means vigilance to ensure that we do not let up until our people are back to work. That means taking steps to rekindle demand, so that a global recovery can be sustained. And that means setting new rules of the road and strengthening regulation for all financial centers, so that we put an end to the greed, excess and abuse that led us into disaster, and prevent a crisis like this from ever happening again.

At a time of such interdependence, we have a moral and pragmatic interest in broader questions of development. And so we will continue our historic effort to help people feed themselves. We have set aside $63 billion to carry forward the fight against HIV/AIDS; to end deaths from tuberculosis and malaria; to eradicate polio; and to strengthen public health systems. We are joining with other countries to contribute H1N1 vaccines to the World Health Organization. We will integrate more economies into a system of global trade. We will support the Millennium Development Goals, and approach next year's Summit with a global plan to make them a reality. And we will set our sights on the eradication of extreme poverty in our time.

Now is the time for all of us to do our part. Growth will not be sustained or shared unless all nations embrace their responsibility. Wealthy nations must open their markets to more goods and extend a hand to those with less, while reforming international institutions to give more nations a greater voice. Developing nations must root out the corruption that is an obstacle to progress - for opportunity cannot thrive where individuals are oppressed and business have to pay bribes. That's why we will support honest police and independent judges; civil society and a vibrant private sector. Our goal is simple: a global economy in which growth is sustained, and opportunity is available to all.

The changes that I have spoken about today will not be easy to make. And they will not be realized simply by leaders like us coming together in forums like this. For as in any assembly of members, real change can only come through the people we represent. That is why we must do the hard work to lay the groundwork for progress in our own capitals. That is where we will build the consensus to end conflicts and to harness technology for peaceful purposes; to change the way we use energy, and to promote growth that can be sustained and shared.

I believe that the people of the world want this future for their children. And that is why we must champion those principles which ensure that governments reflect the will of the people. These principles cannot be afterthoughts - democracy and human rights are essential to achieving each of the goals that I have discussed today. Because governments of the people and by the people are more likely to act in the broader interests of their own people, rather than the narrow interest of those in power.

The test of our leadership will not be the degree to which we feed the fears and old hatreds of our people. True leadership will not be measured by the ability to muzzle dissent, or to intimidate and harass political opponents at home. The people of the world want change. They will not long tolerate those who are on the wrong side of history.

This Assembly's Charter commits each of us, and I quote - "to reaffirm faith in fundamental human rights, in the dignity and worth of the human person, in the equal rights of men and women." Among those rights is the freedom to speak your mind and worship as you please; the promise of equality of the races, and the opportunity for women and girls to pursue their own potential; the ability of citizens to have a say in how you are governed, and to have confidence in the administration of justice. For just as no nation should be forced to accept the tyranny of another nation, no individual should be forced to accept the tyranny of their own government.

As an African-American, I will never forget that I would not be here today without the steady pursuit of a more perfect union in my country. That guides my belief that no matter how dark the day may seem, transformative change can be forged by those who choose the side of justice. And I pledge that America will always stand with those who stand up for their dignity and their rights - for the student who seeks to learn; the voter who demands to be heard; the innocent who longs to be free; and the oppressed who yearns to be equal.

Democracy cannot be imposed on any nation from the outside. Each society must search for its own path, and no path is perfect. Each country will pursue a path rooted in the culture of its people, and - in the past - America has too often been selective in its promotion of democracy. But that does not weaken our commitment, it only reinforces it. There are basic principles that are universal; there are certain truths which are self evident - and the United States of America will never waiver in our efforts to stand up for the right of people everywhere to determine their own destiny.

Sixty-five years ago, a weary Franklin Roosevelt spoke to the American people in his fourth and final inaugural address. After years of war, he sought to sum up the lessons that could be drawn from the terrible suffering and enormous sacrifice that had taken place. "We have learned," he said, "to be citizens of the world, members of the human community."

The United Nations was built by men and women like Roosevelt from every corner of the world - from Africa and Asia; form Europe to the Americas. These architects of international cooperation had an idealism that was anything but naïve - it was rooted in the hard-earned lessons of war, and the wisdom that nations could advance their interests by acting together instead of splitting apart.

Now it falls to us - for this institution will be what we make of it. The United Nations does extraordinary good around the world in feeding the hungry, caring for the sick, and mending places that have been broken. But it also struggles to enforce its will, and to live up to the ideals of its founding.

I believe that those imperfections are not a reason to walk away from this institution - they are a calling to redouble our efforts. The United Nations can either be a place where we bicker about outdated grievances, or forge common ground; a place where we focus on what drives us apart, or what brings us together; a place where we indulge tyranny, or a source of moral authority. In short, the United Nations can be an institution that is disconnected from what matters in the lives of our citizens, or it can be indispensable in advancing the interests of the people we serve.

We have reached a pivotal moment. The United States stands ready to begin a new chapter of international cooperation - one that recognizes the rights and responsibilities of all nations. With confidence in our cause, and with a commitment to our values, we call on all nations to join us in building the future that our people deserve. Thank you.