On an increasingly crowded planet, humanity faces many threats - but none is greater than climate change. It magnifies every hazard and tension of our existence.

To me the question of the environment is more ominous than that of peace and war...I'm more worried about global warming than I am of any major military conflict.

There's one issue that will define the contours of this century more dramatically than any other, and that is the urgent and growing threat of a changing climate.

Heaven speed the canvas, gallantly unfurl'd, To furnish and accommodate a world, To give the Pole the produce of the sun, And knit the unsocial climates into one.

I was raised in a climate where I believed in God because I was afraid of going to hell - and I didn't think that was the right way to fall in love with somebody.

Climate change is a global issue - from the point of view of the Earth's climate, a molecule of CO2 emitted in Bejing is the same as a molecule emitted in Sydney.

I think we`re all experiencing climate change. Experience is an effective teacher. It`s sometimes a very harsh teacher. So we will be taught about climate change.

In a climate of tight budgets, reduced workforces and stiff competition, internal training can be a great substitute for costly offsite workshops and conferences.

We do not know how much our climate could or will change in the future. We do not know how fast change will occur or even how some of our actions could impact it.

The road to climate stability is straight and the solutions simple, and yet scientists, economists, industrialists and politicians are busy making them complicated

Technological measures are important, but equally important is... a consciousness of the commonality of all living beings and an emphasis on shared responsibility.

Protecting biodiversity is just as important and critical to the survival of mankind as stabilizing the climate. Species protection and climate are interdependent.

Worldwide, our oceans are warming, rising, and becoming dangerously acidic as a result of carbon pollution and climate change - endangering much that we hold dear.

President Obama gave a big speech on climate change. He believes global warming is getting worse because apparently he's sweating a lot more during his second term

Unlike Washington, which is stuck in ideological gridlock, Americans feel the impact of climate change in their own hometowns and they know something must be done.

I firmly believe that the principles behind Contraction & Convergence provide the best long-term framework for a fair and equitable climate change mitigation policy

I support a Green New Deal to put people to work building a renewable green energy infrastructure that can help us fight climate change and protect our communities.

All the modelling we do shows that the climate is poised on the jump up to a new hot state. It is accelerating so fast that you could say that we are already in it.

A new study says that working fewer hours can slow global warming. So you know what that means? President Obama's economic policy is also his climate change policy.

We've got to keep our eye on what's happening with Russia and North Korea. We cannot lose sight of domestic policy, either. Healthcare. Immigration. Climate change.

Wind and other clean, renewable energy will help end our reliance on fossil fuels and combat the severe threat that climate change poses to humans and wildlife alike.

While the American people have the impression that scientists are hard at work figuring out this complex matter of climate change, it's not actually that complicated.

I believe, in the words of Dr. Martin Luther King Jr., that there is such a thing as being too late, and when it comes to climate change, that hour is almost upon us.

We see incredible opportunity to solve some of the biggest social challenges we have by combining high-performance computing and AI - such as climate change and more.

I'm a fiscal hawk. I vote against all taxes, but I do believe the environment, and climate change, is a bigger issue than fiscal deficits are as a risk to the nation.

Scientists believe that the invention of clothing in Africa was a key factor in allowing our ancestors to migrate into colder climates and to spread across the globe.

It's too late to stop climate change, that's for sure, but we can still influence the degree of changes and the degree of impacts. We can prepare for a softer landing.

Maryland is among the nation's most vulnerable states to the effects of sea level rise from climate change, and we are taking strong action to reduce carbon pollution.

Right now, the government is spending billions of dollars supporting the problem-makers in the U.S. economy - the polluters, despoilers, incarcerators, and warmongers.

Following the missile crisis, detente started to gain ground between the United States and the Soviet Union, so the international political climate improved after that.

As an issue, climate change was unlucky: when nonspecialists first became aware of it in the 1990s, environmental attitudes had already become tribal political markers.

If the movie had ended in Hollywood fashion, the Copenhagen climate conference in 2009 would have marked the culmination of the global fight to slow a changing climate.

Whether it's a popcorn movie or some really intellectual sociopolitical movie, I think to some degree they're all influenced by the social climate that we're living in.

Climate change involves behaviors that are individually negligible, whose impacts go far beyond the spatial and temporal constraints that define our sense of community.

The more the climate is forced to change, the more likely it is to hit some unforeseen threshold that can trigger quite fast, surprising and perhaps unpleasant changes.

Climate change is, over the longer term, our greatest national security challenge. We have to do all we can to slow it down and to prepare for and ameliorate its impact.

I am afforded a bit of easy wonderment in relative comfort as to how humans have lasted so long. Climate- and geography-wise, the planet seems to have little use for us.

Unfortunately, what is happening now in our central regions is evidence of this global climate change, because we have never in our history faced such weather conditions.

Preservation of the environment, promotion of sustainable development and particular attention to climate change are matters of grave concern for the entire human family.

There's no question that the number one contributor to climate change is livestock production. The quickest way to make an effect is to immediately start on a vegan diet.

The staple of our Australian colonies, but more particularly of New South Wales, the climate and the soil of which are peculiarly suited to its production, - is fine wool.

The Costa Rica experience shows that with dedicated resources, creative institutions, and a sound legal framework, deforestation can be reversed and forest cover expanded.

To date, no convincing evidence for AGW (anthropogenic global warming) has been discovered. And recent global climate behavior is not consistent with AGW model predictions.

Climate change is more remote than terror but a more profound threat to the future of the children and the grandchildren and the great-grandchildren I hope all of you have.

When we are fighting for huge stakes - we're fighting for the future - future of the planet in terms of climate change. We're fighting for the future of American democracy.

So when you're dealing with an existential threat like death or like climate change, if you see it as 'we are all toast anyway,' then denial is a pretty good way of coping.

David Irving is under arrest in Austria for Holocaust denial. Perhaps there is a case for making climate change denial an offence - it is a crime against humanity after all.

There's no happy ending where we prevent climate change any more. Now the question is, is it going to be a miserable century or an impossible one, and what comes after that.

The year 1826 was remarkable for the commencement of one of those fearful droughts to which we have reason to believe the climate of New South Wales is periodically subject.

I think that some of it is electoral - helping candidates that are willing to take dramatic actions, not just to say a few words about how climate change might be a problem.

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