Action Quote by William J. Clinton

The climate crisis is the greatest challenge humanity has ever faced. From not only the warming of the earth with higher global temperatures, but…

— Al Gore

Global warming is not only the number one environmental challenge we face today, but one of the most important issues facing all of humanity...…

— Leonardo DiCaprio

Climate change is a challenge for all of us all over the globe.

— Linda Thomas-Greenfield

We must turn the greatest collective challenge facing humankind today, climate change, into the greatest opportunity for common progress towards a sustainable future

— Ban Ki-moon

Solving the climate crisis is the greatest and most complex challenge that homo sapiens have ever faced. The main solution, however, is so simple…

— Greta Thunburg

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

— Hu Jintao

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

Few challenges facing America and the world are more urgent than combating climate change. The science is beyond dispute and the facts are clear.

— Barack Obama

Climate change is the world's greatest environmental challenge. It is now plain that the emission of greenhouse gases, associated with industrialization and economic growth...is…

— Tony Blair

I do not underestimate the difficulty of the challenge that global climate change presents to us. It will take a significant effort and the…

— Federico Pena

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