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.

There has been a concerted effort to frame caring about climate change and the environment as an alternate religion - one that worships the creation rather than the creator, so to speak.

My faith is an enormous motivator for me to engage as well, because climate change is not just an issue that affects the entire planet, it is one that disproportionately affects those who do not have the resources to cope with this change - those whom we are explicitly told as Christians to care for.

Our carbon emissions have to eventually go to zero. We have to. Otherwise we're never going to have a stable climate and that's what our goal is for human civilization to thrive, a stable climate. We don't want one that's hotter, we don't want one that's colder, we want one that's stable.

People have taken advantage of the very well-trodden pathways that divide science and faith on other issues, such as creation, evolution, and the age of the universe, to pigeonhole climate change as yet another variant on the same theme.

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

My faith tells me that God does want people to understand climate change and do something about it.