what is a major drawback of using fossil fuels? A) they cool the planet B) they release oxygen when burned C) they are flammable D) they release greenhouse gases

They release greenhouse gasses, so D

D: They release greenhouse gases

Explanation:

A greenhouse gas (sometimes abbreviated GHG) is a gas that

absorbs and emits radiant energy within the thermal infrared range.

Greenhouse gases cause the greenhouse effect on planets. The

primary greenhouse gases in Earth's atmosphere are water vapor (H 2

O), carbon dioxide (CO 2), methane (CH 4), nitrous oxide (N 2 O), and

ozone (O3). Without greenhouse gases, the average temperature of

Earth's surface would be about - 18 °C (0 °F), rather than the

present average of 15 °C (59 °F). The atmospheres of Venus,

Mars and Titan also contain greenhouse gases.

Human activities since the beginning of the Industrial Revolution

(around 1750) have produced a 45% increase in the atmospheric

concentration of carbon dioxide, from 280 ppm in 1750 to 415 ppm

in 2019.

Greenhouse gases have far-ranging environmental and health

effects. They cause climate change by trapping heat, and they

also contribute to respiratory disease from smog and air pollution.

Extreme weather, food supply disruptions, and increased wildfires

are other effects of climate change caused by greenhouse gases