U.S. Interior Secretary Ken SalazarApril 28, 1975: Newsweek magazine publishes its famous cover story suggesting that global cooling is underway. The story had little scientific backup, but to this day, it's used by climate skeptics as evidence that climate science can't be trusted.

April 28, 2009: Nine separate federal lawsuits are filed alleging that the military contractor KBR caused cases of lymphoma, leukemia and respiratory diseases in U.S. troops exposed to fumes from open "burn pits." The suits allege that KBR disposed of wastes ranging from plastics to petroleum products to amputated limbs in the open fires at military bases in Iraq and Afghanistan. The practice was first brought to light by the Military Times newspapers.

April 28, 2010: U.S. Interior Secretary Ken Salazar (at right, seen on a tour of Nantucket Sound) issues final approval for Cape Wind, a 130-turbine windfarm located off Cape Cod, Mass. While the project has majority support from the public, prominent Cape Cod residents from the Kennedy family to oil and coal magnate Bill Koch lead the opposition to it. Already stalled nine years by protests and litigations, Cape Wind’s "final" final approval will have to wait for more lawsuits.

Photo: Julia Cumes/AP

This feature is compiled by Peter Dykstra, an MNN contributor and publisher of Environmental Health News and The Daily Climate.