EDS atmopshere

The early atmosphere was mostly

• carbon dioxide from space

• oxygen from trees

• carbon dioxide from volcanoes

The modern atmosphere is

• 80% carbon dioxide, nearly 20% oxygen and a small amount of nitrogen

• 80% oxygen, nearly 20% carbon dioxide and a small amount of nitrogen

• 80% nitrogen, nearly 20% oxygen and a small amount of carbon dioxide

Plants REDUCE carbon dioxide levels in the air because they

• use carbon dioxide in photosynthesis to make glucose

• produce carbon dioxide in respiration to release energy

• store carbon dioxide in the vacuoles of their cells

Humans are increasing carbon dioxide levels because

• we cut down forests and burn fossil fuels

• we plant forests and burn vegetable oils

• we talk lots and that releases carbon dioxide

Increased carbon dioxide levels are causing

• damage to the ozone layer

• acid rain

• an increased greenhouse effect and global warming

Global warming leads to

• climate change, flooding and increased sea levels

• more ice at the South Pole and less at the North Pole

• people cutting down fewer trees