As summer in the northern hemisphere progresses, you see lightning moving farther north. You see a similar pattern in the southern hemisphere, but not so pronounced because there isn't as much land outside the tropics.

These lines fit the pattern over the last 10 to 15 years of reaching ever farther north. But drilling in 10,000 feet of water in the Gulf of Mexico fits the same pattern.

A strangely reflective, even melancholy day. Is that because, unlike our cousins in the northern hemisphere, Easter is not associated with the energy and vitality of spring but with the more subdued spirit of autumn?

The tournament has been an outstanding success in the northern hemisphere for the past two years, playing to packed houses and with strong television ratings.

The hurricanes are following the tropical ocean temperature. The tropical ocean temperature is following the Northern Hemisphere. And it's very hard now to believe that there's anything natural about that.

The most troubling finding is the marked increase in the tropical waters of the northern hemisphere centered around the globe at a latitude of roughly 5 degrees north. If this trend were to continue, implications for our coral reefs throughout these waters would be bleak.