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Thomas H. Clarke, Jr.
National Marine Fisheries Service concurs, pesticides acting together harm salmon

As noted in a prior post, researchers have found that various pesticides act synergistically to harm salmon. The report by scientists of the Northwest Fisheries Science Center evaluated the effects of 5 of the most extensively used pesticides in the Pacific...

Tags: Conservation
Thomas H. Clarke, Jr.
EPA proposes to decrease mercury emissions from cement plants

Prior posts have followed the saga of cement plants and attempts to regulate their mercury emissions. Cement plants are allegedly the fourth largest emitter of mercury in the U.S. [See http://www.epa.gov/mercury/about.htm for general information about...

Tags: Air Quality
Thomas H. Clarke, Jr.
Can the decreasing size of fish due to fishing be reversed? Perhaps

The common practice of catching only the larger fish in a population becomes an evolutionary pressure for later generations to stay small and grow slow, a problem seen emerging with a number of fish species commonly taken for food. A recent study suggests...

Tags: Conservation
Thomas H. Clarke, Jr.
Genome duplication and transposable elements may explain why humans are so different from our closest ancestors, the great apes

This is the last in a series of four posts about the changing view of the evolution of life on Earth. Today's post looks at a question of interest to all of us. Why are humans different from our close relatives, the great apes? There are two interesting...

Thomas H. Clarke, Jr.
Federal District Court turns down challenge to L.A. & Long Beach Ports' "Clean Trucks" program

Prior posts have noted the various challenges filed in state and Federal courts seeking to set aside the air pollution reduction plans of the Ports of L.A. and Long Beach. As noted in those posts, the most recent challenge was brought by the Federal Maritime...

Tags: Air Quality
Thomas H. Clarke, Jr.
Complex life may have started earlier than commonly accepted

This is the third in a series of posts on the ever-changing science of evolution and life on Earth. Prior posts have discussed that the evidence that an oxygenated atmosphere may have existed a billion years earlier than commonly accepted, and that prokaryotes...