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As part of our Leadership Hall of Fame series, we continue our fresh look at The Tipping Point with an interview of author Malcolm Gladwell.

Nearly 200 Kemp's ridley ( Lepidochelys kempii ), green ( Chelonia mydas ) and loggerhead ( Caretta caretta ) sea turtles washed up along the Louisiana, Mississippi and Alabama coasts in April, the most deaths in one month since record keeping began in 1986. And 100 green sea turtles were found dead on the coast of Uruguay in the first three months of this year.

From forest die-offs to melting Arctic ice, there are many possibilities for how climate change will affect the planet. But some have a larger chance of happening than others. Which should we be prepared for most, and working hardest to prevent?

The "three-year glitch" has replaced the "seven-year itch" as the tipping point where couples start to take each other for granted, according to a new survey.