Deepwater Horizon spillJuly 5, 1936: The upper Midwest of the U.S. endures the first of 14 straight days with temperatures in the 90s or 100s. The North American Heat Wave of 1936 is still the worst on record for the U.S.

July 5, 1972: The U.S. suspends its secret "Operation Popeye" in Southeast Asia. Journalist Jack Anderson had revealed the top-secret operation to attempt cloud-seeding in Laos, Cambodia and Vietnam to slow the progress of North Vietnamese troops. The U.S. does not formally admit the existence of the program until 1974.

July 5, 2010: BP reports that is has captured more than 650,000 barrels of oil and spent more than $3 billion on cleanup costs since the April 20 explosion and subsequent spill from the Deepwater Horizon oil rig in the Gulf of Mexico.

Photo: Deepwater Horizon Response/Flickr

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

July 5
The worst heatwave in U.S. history begins, and 'Operation Popeye' is suspended.