Big Quote by Ban Ki-moon

Think about this: terrorism, epidemics, poverty, the proliferation of weapons of mass destruction-all challenges that know no borders-the reality is that climate change ranks…

— John F. Kerry

Climate change is a shared crisis - one that transcends politics and borders and must be fought collectively, justly and transparently.

— Barry Gardiner

Global climate change has a profound impact on the survival and development of mankind. It is a major challenge facing all countries.

— Hu Jintao

Given the nature and magnitude of the challenge, national action alone is insufficient. No nation can address this challenge on its own. No region…

— Ban Ki-moon

Climate change and global poverty are two sides of the same coin. Both challenges must be addressed together. If we fail on one, we…

— Nicholas Stern

...the world needs to face up to the challenge of climate change, and to do so now. It is clear that climate change poses…

— Gordon Brown

Climate change demands a collective response. We can't expect other countries to act if we don't.

— Caroline Lucas

Climate change is something that we cannot fix alone - it is the original collective action problem - it will not work unless almost…

— Abhijit Banerjee

We face a climate crisis now that is the most serious challenge our civilization has ever confronted. And the greatest country in the world…

— Al Gore

The climate challenge illustrates how we have to change. The developing countries need more support and opportunities to develop and use clean energy. Because…

— Gro Harlem Brundtland

Global climate change is one of the greatest challenges facing humanity in the twenty-first century.

— Angela Merkel

Climate change is a global commons problem.

— Ottmar Edenhofer