Science

Environmental Protection Agency Administrator Scott Pruitt waves to members of the audience as he arrives for a news conference at the Environmental Protection Agency in Washington, Tuesday, April 3, 2018, on his decision to scrap Obama administration fuel standards. (AP Photo/Andrew Harnik)

Florida Gov. Rick Scott, center, and Department of the Interior Secretary Ryan Zinke, right, announce that there will be no new offshore drilling in the Florida, during a news conference at the Tallahassee International Airport, Jan. 9, 2018. The Florida announcement triggered immediate criticism from other states opposed to the oil drilling plan. (Scott Keeler / Tampa Bay Times via AP)

FILE - In this Nov. 10, 2017 file photo, Indian commuters wait for transport amid a thick blanket of smog on the outskirts of New Delhi, Nov. 10. 2017. The petroleum coke (petcoke) being burned in countless factories and plants is contributing to dangerously filthy air in India, which already has many of the world's most polluted cities. India's energy-hungry industries like petcoke because it's cheaper and burns hotter than coal; they also defend their use by saying they're recycling a waste that's being produced anyway. (AP Photo/Altaf Qadri, File)

Rescue workers search for survivors at an apartment building located on the street corner of Amsterdam and Laredo, that collapsed during an earthquake in the Condesa neighborhood of Mexico City, Thursday, Sept. 21, 2017. Tuesday's magnitude 7.1 earthquake has stunned central Mexico, killing more than 200 people as buildings collapsed in plumes of dust. (AP Photo/Natacha Pisarenko)

A Houston neighborhood near Addicks Reservoir is flooded by rain from Hurricane Harvey, Aug. 29, 2017. HoustonÕs population is growing quickly, but when Harvey hit there were far fewer homes and other properties in the area with flood insurance than just five years ago, according to an Associated Press investigation. (AP Photo/David J. Phillip, File)