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If current rates of use and extraction do not change, known natural gas reserves are expected to last _____ years.

Which reason is NOT one why our energy supplies may become unreliable or unaffordable?

Without greenhouse gases, the average temperature on Earth would be:

_____ is/are anything that alters the balance of incoming solar radiation relative to the amount of heat that escapes out into space.

_____ is the ability of a surface to reflect away solar radiation.

Use the following scenario to answer the question(s) below.You are talking with some friends. Your friend Jessica says she doesn’t believe in climate change, since the Earth has always gone through warming cycles. She says all the impacts we are experiencing now are a result of those cycles, and they will eventually slow down and stop as the Earth comes out of the cycle. “Plus,” she says, “it’s been really cold this winter, so there can’t be a changing climate.” Reference: Ref 10-3 You tell Jessica evidence for climate change can be seen in:

Use the following scenario to answer the question(s) below.The issue of how to meet our future energy needs is a wicked problem. We want to increase our energy independence and energy security. The United States has large deposits of unconventional oil and natural gas reserves, while the majority of conventional reserves are located in other areas of the world. Conventional oil and gas reserves are easiest to retrieve out of the earth, and we have used those supplies for our energy needs so far. As we deplete those conventional reserves, we turn to unconventional oil and gas reserves for more sources. Reference: Ref 9-3 Why is meeting our future needs considered a wicked problem?

Which statement is FALSE regarding positive feedback loops?

Fracking is a method to extract _____ from deep unconventional reserves.

Which organisms are expanding their range and distribution due to climate change?