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I believe that climate change represents one of the greatest threats to our national security and our planet.

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.

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

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.

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

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

In the case of climate change, the threat is long-term and diffuse and requires broad international action for the benefit of people decades in the future. And in politics, the urgent always trumps the important, and that is what makes it a very difficult and challenging issue.

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