According to Arlie Russell Hochschild from her recent book Strangers in Their Own Land,
The National Association of Evangelicals is a voice for its 30,000,000 members, who make up a quarter of the American electorate, and a leading organization of the religious right with a political voice. This is true too of the Christian Coalition, which supported some 36 senators and 243 members of the House of Representatives, half of whom received a score of 10 percent or lower on the environmental scorecard of the League of Conservation Voters. (Kindle Locations 2109-2112)
It would seem nearly impossible to make forward progress on environmental concerns while holding the above belief. Given the magnitude of America's carbon footprint and its disproportionate effect on climate change - e.g. through its own emissions of green house gases and its influence on international decisions like the Paris Agreement - this seems to suggest that some 30 million evangelical Americans are deciding the future of the planet. That is roughly 0.4 percent of the current world population.
Eight-one percent of evangelicals backed Trump in the recent election, who has promised to, "lift the restrictions on the production of $50 trillion dollars' worth of job-producing American energy reserves, including shale, oil, natural gas and clean coal" and "cancel billions in payments to U.N. climate change programs".