this makes it difficult to devise appropriate policy measures that might stem the growth of methane in the atmosphere.
Subduction and volcanic emissions compose a long-term, slow cycle for carbon and these elements.
we are bathed in, and breathe, an atmosphere with an arsenic content vastly in excess of what we have experienced during our evolutionary history as a species.
the storage of plant-derived carbon in everyday products that are landfilled may help sequester carbon from the atmosphere.
Methane concentrations were relatively constant in the atmosphere until the beginning of the Industrial Revolution.
The benefits of reducing mercury pollution deposited from the atmosphere are quickly reflected throughout the ecosystem.
It will take a long time to flush this past memory of nitrogen use out of the ecosystem.
The hydrogen content of the atmosphere has increased 70% since the late 1800s,
The past use of phosphorus fertilizers has left of legacy of pollution that we must consider if we are to have any success in cleaning up water quality.
the color of rivers seen from space may provide a better index of the health of rivers than simple visual observations from land
