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
Pores and cracks in the rocks host microbial activity that feeds on hydrogen generated by volcanic activity,
Inasmuch as the runoff of nitrogen is an interstate transport problem, managing the application of fertilizer and loss of nitrogen to runoff should be a high priority for the Federal government.
The popularity of natural gas as a fossil fuel and its increased use are attractive candidates to explain the potential for increased leakage to the atmosphere.
The emission of carbon dioxide from the production of cement current accounts for about 5% of the total annual industrial emissions of CO2.