Answer:
A. Greenhouse gas feedback
Explanation:
Greenhouse effect is a natural atmospheric phenomenon responsible for maintaining life on earth. Without the presence of this phenomenon, the temperature on Earth would be very low, around -18ºC, which would make the development of living beings impossible.
There are several greenhouse gases in the atmosphere capable of absorbing solar radiation radiated from the earth's surface, preventing all heat from returning to space. Part of the energy emitted by the sun to Earth is reflected into space, some is absorbed by the earth's surface and oceans. A portion of the heat radiated back into space is retained by the greenhouse gases present in the atmosphere. In this way, the energy balance is maintained, so that there are no large thermal amplitudes and temperatures are stable.
However, the high concentration of these gases in the atmosphere makes it even more difficult for heat to disperse into space, increasing the planet's temperatures. The greenhouse effect has been aggravated by the increasing emission of greenhouse gases into the atmosphere. This emission is caused by anthropogenic activities such as burning of fossil fuels, gases emitted by car exhausts, waste treatment, fertilizer use, agricultural activities and various other industrial processes.
