6. 4
Greenhouse gas exchange in boreal wetland ecosystems.

Did you know?
Wetland ecosystems are important stores of carbon that are released when the climate gets warmer or when the ecosystems are disturbed.
See resources for section 6.3
Wetland ecosystems include moss-peat lands, swamps with trees and mires with grasses and grass-like plants.
Carbon dioxide is heavier than air, so it accumulates at the bottom of caves and tunnels under rivers where it can be dangerous. When you go through a tunnel on a road, try to find the fans that remove the CO2 from the tunnel's air.