He's called EPA regulations "coercion" and has fought to slow down the move away from fossil fuels.
Compared to much of the world, the U.S. has tried to tackle the problem head-on.
Researchers predict nearly a third of the global polar bear population could die out in as little as the next 35 years.
The request came a day after the U.S. Army Corps of Engineers said it would look into alternative pipeline routes.
The company plans to buy enough green energy to cover 100 percent of its global operations.
Modern society makes our immune systems complacent and prone to overreaction, which is why allergies are on the rise.