Climate Change Quiz – 15 Questions

Question 8: What is a “safe” level of greenhouse gas concentration in our air?
350 parts per million
Yes! Right! A stable level of 350 parts per million in our air is expected to lead to around 1.5 degrees Celsius of warming. But, we’ve already broken past 400 parts per million as of 2016, and we’re still rising. At 450 parts per million, scientists expect a 2-in-3 chance or more of warming by 2 degrees Celsius. To bring this back down to a safe level, we need to plant trees to absorb carbon dioxide from the air, and cut down our emissions to zero so we stop pumping more into the air. The good news? We have lots of solutions to do just this. The bad news? Not enough of us are convinced we need to change.
400 parts per million
No, 350 parts per million is the right answer. A stable level of 350 parts per million in our air is expected to lead to around 1.5 degrees Celsius of warming. But, we’ve already broken past 400 parts per million as of 2016, and we’re still rising. At 450 parts per million, scientists expect a 2-in-3 chance or more of warming by 2 degrees Celsius. To bring this back down to a safe level, we need to plant trees to absorb carbon dioxide from the air, and cut down our emissions to zero so we stop pumping more into the air. The good news? We have lots of solutions to do just this. The bad news? Not enough of us are convinced we need to change.
450 parts per million
No, 350 parts per million is the right answer. A stable level of 350 parts per million in our air is expected to lead to around 1.5 degrees Celsius of warming. But, we’ve already broken past 400 parts per million as of 2016, and we’re still rising. At 450 parts per million, scientists expect a 2-in-3 chance or more of warming by 2 degrees Celsius. To bring this back down to a safe level, we need to plant trees to absorb carbon dioxide from the air, and cut down our emissions to zero so we stop pumping more into the air. The good news? We have lots of solutions to do just this. The bad news? Not enough of us are convinced we need to change.
500 parts per million
No, 350 parts per million is the right answer. A stable level of 350 parts per million in our air is expected to lead to around 1.5 degrees Celsius of warming. But, we’ve already broken past 400 parts per million as of 2016, and we’re still rising. At 450 parts per million, scientists expect a 2-in-3 chance or more of warming by 2 degrees Celsius. To bring this back down to a safe level, we need to plant trees to absorb carbon dioxide from the air, and cut down our emissions to zero so we stop pumping more into the air. The good news? We have lots of solutions to do just this. The bad news? Not enough of us are convinced we need to change.
1000 parts per million
Whoa! This would be a world in the microwave! No, 350 parts per million is the right answer. A stable level of 350 parts per million in our air is expected to lead to around 1.5 degrees Celsius of warming. But, we’ve already broken past 400 parts per million as of 2016, and we’re still rising. At 450 parts per million, scientists expect a 2-in-3 chance or more of warming by 2 degrees Celsius. To bring this back down to a safe level, we need to plant trees to absorb carbon dioxide from the air, and cut down our emissions to zero so we stop pumping more into the air. The good news? We have lots of solutions to do just this. The bad news? Not enough of us are convinced we need to change.

Add +1 to your score if you got it right!

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