It's easier to discredit the science than to say that climate change is a genuine issue but we don't want to do anything about it.

A person of faith who shares conservative values and who says very clearly that climate change is real - and here's why we have to care about it - I think that we "unicorns" do pose a threat to people who want to muddy the waters and keep others in the dark.

We have to reach out to churches and schools and help people understand science, and we have to build rapport between scientists and people of faith. Then once we get that understanding and rapport built, then everyone will be on board with climate change.

I feel like a physician, one who's done a scan of the patient's body and seen evidence of a potentially serious issue.

One of the biggest issues with renewables right now is the fact that if the wind isn't blowing, if the sun isn't shining, we don't have energy. Many people are working on storage technology so when the wind isn't blowing, we can use the energy stored in our giant batteries, essentially. But what happens if we don't have enough stored energy?

There is no set period of time or total amount of carbon emissions that we can stay below to ensure we stay safe.

The word "evangelist" means someone who spreads good news. Studying the impacts of climate change as I do, it's hard to come up with good news. In many ways I feel more like a Cassandra or a Jeremiah than a good-news evangelist.