How do we know this?
What will be an ideal response?
Keeling's data show that the mean atmospheric CO2 level for today is around 389 ppm. The ice core measurements show that the preindustrial CO2 concentration (the value circa 1800) was about 280 ppm, so the CO2 concentration has increased by 109 ppm.
The average rate of increase in the CO2 concentration since 1800 has been 109 ppm/209 yr, or about 0.5 ppm /yr.
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An oxygen sag curve occurs when
a. Fish population numbers sag. b. Heavy metals that have entered a stream bind oxygen molecules and remove them from the available oxygen supply. c. The breakdown of biodegradable wastes by bacteria lowers the available oxygen in the water for organisms with high oxygen requirements. d. Carbon dioxide values exceed dissolved oxygen values. e. Oxygen content in the air around a particular body of water becomes slightly lower than normal
Hawaiian volcanoes are examples of:
a) Shield volcanoes b) Stratovolcanoes (or composite cones) c) Cinder cones (or scoria cones) d) Mud volcanoes e) Lava domes
Despite challenges to agriculture, like high latitude and only around twenty inches of precipitation annually, Russia does have a large amount of arable land
Indicate whether the statement is true or false
What are some costs not included in the market price of coal-generated electricity?
What will be an ideal response?