The sixth report from the United Nation’s Intergovernmental Panel on Climate Change is alarming—but not surprising.

The panel’s first assessment of scientific research on climate change in 1990 found that burning fossil fuels substantially increases the atmospheric concentrations of greenhouse gases—including carbon dioxide, methane, chlorofluorocarbons, and nitrous oxide—causing a rise in the global mean temperature and warming up the world’s oceans.

“Consequent changes,” the first report said, “may have a significant impact on society.” //

Policy makers, scientists, and concerned citizens who pick up the final version of the report might be surprised by one thing, though: It is dedicated to an evangelical Christian who said the root problem of climate change is sin.

“Looking after the Earth is a God-given responsibility,” John Houghton once wrote. “Not to look after the Earth is a sin.”

Houghton, who died of complications related to COVID-19 in 2020 at the age of 88, was the chief editor of the first three IPCC reports and an early, influential leader calling for action on climate change.

His concerns about greenhouse gases, rising temperature averages, dying coral reefs, blistering heat waves, and increasingly extreme weather were informed by his training at as atmospheric physicist and his commitment to science. They also come out of his evangelical understanding of God, the biblical accounts of humanity’s relationship to creation, and what it means for a Christian to follow Christ. //

As Houghton saw it, some religions teach that the Earth and the material world are evil. But the Bible teaches that creation is good, and depicts humans as gardeners divinely commissioned to cultivate and care for the world.

“We are more often exploiters and spoilers rather than gardeners,” Houghton wrote. “Some Christians have misinterpreted the ‘dominion’ given to humans in Genesis 1.26 as an excuse for unbridled exploitation. However, the Genesis chapters, as do other parts of scripture, insist that human rule over creation is to be exercised under God, the ultimate ruler of creation, with the sort of care exemplified by this picture of humans as ‘gardeners.’”

Houghton began to reach out to evangelical leaders to talk to them about the coming ecological crisis. He was influential in convincing Richard Cizik, John Stott, and Rick Warren to make climate change a priority and talk about it as a spiritual problem. //

According to Malcolm, who is now preparing for ministry in the Church of England and writing a doctoral dissertation on theology and climate grief, Houghton thought it was it was impossible to convince people to protect something they didn’t love. He wanted Christians to learn to love their environment and let climate change science move them to repentance.

“Our desire to be gods drives a great deal of the destruction around us,” she said. “There is something in the work of climate science that reveals the consequence of our sin, troubles those in power, and calls for us to sit with that, but also be aware that an alternative is possible—an alternative to our sin.”

Houghton didn’t live to see the release of the sixth IPCC report or to promote it to evangelical Christians. But the scientific assessment dedicated to his memory echoes a core theme of Houghton’s life’s work: Now is the time, it says, to turn from the path of destruction.