The greenhouse effect:

if you have ever visited a greenhouse, you know that these structures trap heat to keep plants warm. the greenhouse effect on earth works in much the same way. sunlight passes through earth's atmosphere. some of the sun's heat is absorbed by land, air, and water. the rest is reflected back into space or trapped by gases such as carbon dioxide, water vapor, and methane within the atmosphere. the trapped heat raises earth's temperature and makes it suitable for supporting life. without the greenhouse effect, earth would be too cold for humans. however, if the greenhouse effect becomes stronger, it could cause earth's temperature to rise too much and have a serious negative impact.

a.
the trapped heat raises earth's temperature and makes it suitable for supporting life.

b.
however, if the greenhouse effect becomes stronger, it could cause earth's temperature to rise too much and have a serious negative impact.

c.
sunlight passes through earth's atmosphere.

d.
if you have ever visited a greenhouse, you know that these structures trap heat to keep plants warm.