After doing the Sustainability quiz, I must say there is so much to learn about the environment. I am hoping this class with teach me deeper with knowledge.

• For an example I didn’t know coffee maker consume up to 900 watts when in operation.
• Also , I didn’t know the amount of mercury is very small, but CF bulbs should be disposed of properly

Prior to the industrial revolution the highest recorded concentration of CO2 in the atmosphere over the last several hundred thousand years is around 300 parts per million (ppm). What is the concentration today?

This question made me thinking. I finally got it after taking it like three times.

Pick the best answer

280 ppm

300 ppm

380 ppm

450 ppm