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The impact of climate change is a tremendous risk to the security and well-being of our countries.

I believe global warming and climate change are real threats to our planet.

We have to face the reality of climate change. It is arguably the biggest threat we are facing today.

Climate change is a very real threat right now to our economy, the future of our children, to our way of life.

The area of climate change has a dramatic impact on national security.

Around the world, climate change is an existential threat - but if we harness the opportunities inherent in addressing climate change, we can reap enormous economic benefits.

If we do not change our negative habits toward climate change, we can count on worldwide disruptions in food production, resulting in mass migration, refugee crises and increased conflict over scarce natural resources like water and farm land. This is a recipe for major security problems.

Any objective look at what science has to say about climate change ought to be sufficient to persuade reasonable people that the climate is changing and that humans are responsible for a substantial part of that - and that these changes are doing harm and will continue to do more harm unless we start to reduce our emissions.

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

Greenhouse gas pollution, through its contribution to global climate change, presents a significant threat to Americans' health and to the environment upon which our economy and security depends.