“No, I don’t!” I cheerfully replied.

A puzzled silence ensued. Wary of calling out the pastor’s wife, the man haltingly asked, “But aren’t you … didn’t you just say you study climate science?”

“That’s right,” I said with an encouraging nod.

“So how can you not believe in it?!” he asked, perplexed.

And with that question, he opened the door to an incredibly constructive conversation about science, faith and truth. As I always do now when someone asks this, I explained that climate change is not a belief system. We know that the earth’s climate is changing thanks to observations, facts and data about God’s creation that we can see with our eyes and test with the sound minds that God has given us. And still more fundamentally, I went on to explain why it matters: because real people are being affected today; and we believe that God’s love has been poured in our hearts to share with our brothers and sisters here and around the world who are suffering.

After h undreds, even thousands, of such conversations, I’ve grown to understand how much of this opposition to the idea that the climate is changing, that humans are responsible, that the impacts are serious and that the time to act is now, comes from fear: fear of loss of our way of life, fear of being told that our habits are bad for society, fear of changes that will leave us worse off, fear of siding with those who have no respect for our values and beliefs.

But as a Christian, I believe the solution to this fear lies in the same faith that many non-Christians wrongly assume drives our rejection of the science. In the Apostle Paul’s letter to Timothy, he reminds us that we have not been given a spirit of fear. Fear is not from God. Instead, we’ve been given a spirit of power, to act rather than to remain paralyzed in anxiety, fear, or guilt; a spirit of love, to have compassion for others, particularly those less fortunate than us (the very people most affected by a changing climate); and a sound mind, to use the information we have to make good decisions.

And you know what? These are the very tools we need to address climate change .

Connecting our identity to action is key, and that’s exactly why I don’t typically begin with science when starting conversations about climate change with those who disagree. Rather, I begin by talking about what we share most. For some, this could be the well-being of our community; for others, our children; and for fellow Christians, it’s often our faith.

By beginning with what we share and then connecting the dots between that value and a changing climate, it becomes clear how caring about this planet and every living thing on it is not somehow antithetical to who we are as Christians, but rather central to it. Being concerned about climate change is a genuine expression of our faith, bringing our attitudes and actions more closely into line with who we already are and what we most want to be.

And that’s why I’m more convinced now than ever that the two most central parts of my identity — that of climate scientist and evangelical Christian — aren’t incompatible. They are what’s made me who I am.

Katharine Hayhoe is a climate scientist at Texas Tech University in Lubbock, where she co-directs the Climate Center, hosts the PBS digital series “Global Weirding” and is writing a book on how to talk about climate change with people who don’t agree.

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