In thinking about future generations, I cannot imagine anything more important than taking action to deal with climate change. It's a concern I carry with me a lot.
If we don't act now, I worry that the students I'm teaching kindergarten will face as adults problems much more severe than anything any generation has faced before. See the movie "An Inconvenient Truth" if you have not seen it already.
For my part, even though I live only about 10 km from my work, I carpool with the second grade teacher. It cuts in half the amount of CO2 spewing into the atmosphere from my getting to work.
My family manages to have at least one car-free day each week. We often manage more. Neither of our kids has a car or drives.
Still, as Americans, my family contributes far more to global warming than our share as citizens of the earth.
I try not to fly.
Did you know that when you fly in a commercial jetliner you are responsible for adding MORE CO2 if you were to drive a car to your destination?
Think of each jet aircraft in the sky as a giant caravan of RVs in the sky. One RV for each passenger. I've seen estimates that put the mileage per passenger on a jet from 2 miles per gallon per passenger to about 15 MPGPP.
I have no idea which estimate is right. But For the earth's sake, flying should be rationed. If you've ever flown, even once, you're among the 5% of the people on earth who have ever flown.
19 out of 20 people never have been in an airplane, and never will.
The story below appeared last Wednesday on the Yahoo! news site. Read below, or follow this LINK
By SETH BORENSTEIN and DAN JOLING, Associated Press Writers Wed Aug 27, 7:23 PM ET
WASHINGTON - More ominous signs Wednesday have scientists saying that a tipping point" in the Arctic seems to be happening before their eyes: Sea ice in the Arctic Ocean is at its second lowest level in about 30 years."
The National Snow and Ice Data Center reported that sea ice in the Arctic now covers about 2.03 million square miles. The lowest point since satellite measurements began in 1979 was 1.65 million square miles set last September.
With about three weeks left in the Arctic summer, this year could wind up breaking that previous record, scientists said.
Arctic ice always melts in summer and refreezes in winter. But over the years, more of the ice is lost to the sea with less of it recovered in winter. While ice reflects the sun's heat, the open ocean absorbs more heat and the melting accelerates warming in other parts of the world.
Sea ice also serves as primary habitat for threatened polar bears.
"We could very well be in that quick slide downward in terms of passing a tipping point," said senior scientist Mark Serreze at the data center in Boulder, Colo. "It's tipping now. We're seeing it happen now."
Within "five to less than 10 years," the Arctic could be free of sea ice in the summer, said NASA ice scientist Jay Zwally.
"It also means that climate warming is also coming larger and faster than the models are predicting and nobody's really taken into account that change yet," he said.
Five climate scientists, four of them specialists on the Arctic, told The Associated Press that it is fair to call what is happening in the Arctic a "tipping point." NASA scientist James Hansen, who sounded the alarm about global warming 20 years ago before Congress, said the sea ice melt "is the best current example" of that.
Last year was an unusual year when wind currents and other weather conditions coincided with global warming to worsen sea ice melt, Serreze said. Scientists wondered if last year was an unusual event or the start of a new and disturbing trend.
This year's results suggest the latter because the ice had recovered a bit more than usual thanks to a somewhat cooler winter, Serreze said. Then this month, when the melting rate usually slows, it sped up instead, he said.
The most recent ice retreat primarily reflects melt in theoff Alaska's northwest coast and the off the coast of eastern Russia, according to the center.
The Chukchi Sea is home to one of two populations of Alaska polar bears.
Federal observers flying for a whale survey on Aug. 16 spotted nine polar bears swimming in open ocean in the Chukchi. The bears were 15 to 65 miles off the Alaska shore. Some were swimming north, apparently trying to reach the polar ice edge, which on that day was 400 miles away.
Polar bears are powerful swimmers and have been recorded on swims of 100 miles but the ordeal can leave them exhausted and susceptible to drowning.
And the melt in sea ice has kicked in another effect, long predicted, called "Arctic amplification," Serreze said.
That's when the warming up north is increased in a feedback mechanism and the effects spill southward starting in autumn, he said. Over the last few years, the bigger melt has meant more warm water that releases more heat into the air during fall cooling, making the atmosphere warmer than normal.
On top of that, researchers were investigating "alarming" reports in the last few days of the release of methane from long frozen Arctic waters, possibly from the warming of the sea, said Greenpeace climate scientist Bill Hare, who was attending a climate conference in Ghana. Giant burps of methane, which is a potent greenhouse gas, is a long feared effect of warming in the Arctic that would accelerate warming even more, according to scientists.
Overall, the picture of what's happening in the Arctic is getting worse, said Bob Corell, who headed a multinational scientific assessment of Arctic conditions a few years ago: "We're moving beyond a point of no return."
Science Writer Seth Borenstein reported from Washington and Dan Joling reported from Anchorage, Alaska. AP writer Arthur Max contributed from Accra, Ghana.