With so much evidence of depleting natural resources, toxic waste, climate change, irreparable harm to our food chain and rapidly increasing instances of natural disasters, why do we keep perpetuating the problem? Why do we continue marching at the same alarming beat?

I have been described as the grandfather of climate change. In fact, I am just a grandfather and I do not want my grandchildren to say that grandpa understood what was happening but didn't make it clear.

I don't use any animal products, both because of ethical and environmental and climate reasons.

The European nations take climate change very seriously.

The problem is we don't know what the climate is doing. We thought we knew 20 years ago. That led to some alarmist books - mine included - because it looked clear-cut, but it hasn't happened.

I'm obviously in favor of a carbon tax. And I think climate change is one of the biggest threats to our planet.

Climate change is real.

If we have to save the world from the adverse effects of climate change, then developed nations must lift the deprived with financial and technical resources.

Climate change brings increasingly frequent and severe weather patterns and this means more floods.

Fragile economies and weak infrastructures tend to worsen the results of climate disruptions, a problem exemplified by Bangladesh's vulnerability to monsoons, accelerating desertification in northern China, and, most visibly, Hurricane Katrina's devastation in New Orleans.

I think it's wrong to compromise your values to fit in with the social climate in Washington, D.C. When it comes to spending, I'm not compromising. I don't care who, what, when or where, I'm not compromising.

Climate change is a threat to the conditions in which our economy can function at all.

The U.S. has fallen well behind Europe in recognizing climate change and the implications of climate change.

China has adopted and is implementing its national climate change program. This includes mandatory national targets for reducing energy intensity and discharge of major pollutants and increasing forest coverage and the share of renewable energy for the period of 2005 through 2010.

We continue to take seriously climate change - not the cause of it, but the things that we observe.

Meat's effect on climate change simply cannot be ignored.

If you're serious about climate targets, you don't build and expand the oil sands and move from coal-fired electricity to inefficient fracked gas.

When President Trump withdrew from the Paris Climate Accords, he acted irresponsibly given the trajectory of the global climate and severely lessened our power internationally.

I've grown accustomed to hotels and drastic climate change.

Diseases are a threat to us all. And so is climate change.