Constructed wetlands do a good job in their early years of capturing carbon in the environment that contributes to climate change—but that ability does diminish with time as the wetlands mature, a new study suggests. Constructed wetlands do a good job in their early years of capturing carbon in the environment that contributes to climate change—but that ability does diminish with time as the wetlands mature, a new study suggests. Earth Sciences Environment Phys.org – latest science and technology news stories