1. although their concentration in the atmosphere is lower than carbon dioxide, blank absorb earth's outgoing radiation and cause warming of the troposphere.target 1 of 5 2. when a component of the climate system is altered, the possible responses are known as blankfeedback mechanisms.target 2 of 5 3. effects that reinforce the initial climate system change are called blank -feedback mechanisms.target 3 of 5 4. because they reflect sunlight back into space, blank have a net cooling effect on the climate system.target 4 of 5 5. effects that produce the opposite results from the initial climate change are referred to as blank- feedback mechanisms.