The administration is not only allowing more greenhouse gases. It is undermining the nation’s ability to understand and respond to a hotter planet.When the Trump administration declared two weeks ago that it would largely disregard the economic cost of climate change as it sets policies and regulations, it was just the latest step in a multipronged effort to erase global warming from the American agenda.But President Trump is doing more than just turning a blind eye to the fact that the planet is growing hotter. He is weakening the country’s capacity to understand global warming and to prepare for its...