A Quote by John Holdren

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.
Humans are not responsible for climate change in the way some of people are trying to make us believe, for the following reason: I believe the climate is changing because there's never been a moment where the climate is not changing.
Despite the international scientific community's consensus on climate change, a small number of critics continue to deny that climate change exists or that humans are causing it. Widely known as climate change "skeptics" or "deniers," these individuals are generally not climate scientists and do not debate the science with the climate scientists.
We must prepare for a changing climate by incorporating climate preparedness into every aspect of our planning - for food, water, health, energy, even national security. We must reduce our emissions to prevent even more dangerous change.
The media when it focuses on climate change at all, does so in terms of carbon emissions and how to reduce them. Only rarely do our leaders advance arguments about adapting our environment and our economy to the effects of climate change that are already inevitable.
I have felt for a long time that the pathway to solving the climate crisis is through the building of a massive grassroots army of men and women who will go out there and win the conversation on climate, and persuade businesses, and universities, and towns to switch to renewable energy and to reduce emissions. And the big change from ten years ago is that people are way more receptive, not only to the message that we have to act, not only to the message that now we can act, we have the solutions now - that's the biggest change - but also willing to make a commitment that we will act.
Look, first of all, the climate is changing. I don't think the science is clear what percentage is man-made and what percentage is natural. It's convoluted. And for the people to say the science is decided on, this is just really arrogant, to be honest with you, it's this intellectual arrogance that now you can't even have a conversation about it. The climate is changing, and we need to adapt to that reality.
Climate change is real. Climate change is being substantially increased by humans and the carbon we put into the atmosphere. And it appears to be speeding up. If science has made any mistakes, science has been underestimating it.
Both San Francisco and New York are taking bold, sweeping action to reduce emissions, make our infrastructure more resilient and improve the health of our people. We are also leading the charge against those who continue to deny the existence of climate change.
Climate has always changed. It always has and always will. Sea level has always changed. Ice sheets come and go. Life always changes. Extinctions of life are normal. Planet Earth is dynamic and evolving. Climate changes are cyclical and random. Through the eyes of a geologist, I would be really concerned if there were no change to Earth over time. In the light of large rapid natural climate changes, just how much do humans really change climate?
I am worried about climate change. In one respect, I may be more worried than other people. I am worried because I have very little confidence that we know what is causing it....One of my fears is that we could reduce carbon emissions by some drastic amount, only to discover that-oops-it turns out that climate change is being caused by something else.
Pollution from human activities is changing the Earth's climate. We see the damage that a disrupted climate can do: on our coasts, our farms, forests, mountains, and cities. Those impacts will grow more severe unless we start reducing global warming pollution now.
I come back to the science that is in it to reduce our dependence on foreign oil and climate change. It's about science, science, science and science, innovation, as we rebuild America, create jobs, invest in our people and turn this economy around.
It is manifestly in the interest of the United States to deal with the very real threat that climate change poses. And that's why President Obama has worked so hard to reduce our own emissions and to lead internationally in forging the Paris climate agreement.
The bottom billion people don't contribute at all to climate change - maybe 1 percent of emissions, they could double or triple their emissions and the climate would not be destabilised.
We can debate this or that aspect of climate change, but the reality is that most people now accept our climate is indeed subject to change as a result of greenhouse gas emissions.
Of course climate changes. Many changes are due to factors over which humans have no control, such as winds, ocean currents, and sun activity. But the liberals want us to believe that climate change is also caused by gases expelled when humans burn so-called fossil fuels.
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