Water is heavy. Groundwater actually weighs down the Earth's crust as it floats on the mantle.
When you remove the water, the crust gets lighter, and floats higher.
Research by the University of California - Berkeley shows that the weight of water pumped from California's agricultural heartland, the Central Valley, over the past 150 years is enough to allow Earth's crust to rebound upward, raising surrounding mountain ranges, the Sierra Nevada and Coast Ranges, some six inches.
The rising seems to be causing more small earthquakes along the San Andreas fault.
In addition, even a 6 inch rise in the mountains can affect winds and rain. Tall mountains create deserts.
In other words, by pumping vast amounts of water from the ground, we are decreasing the amount of water that falls from the sky over California.
When I was teaching, I used this blog to communicate with my students.
Now I use it to share my photos.
Contact: webmaster at jschwartz.com
Thursday, May 15, 2014
Saturday, May 10, 2014
International Migratory Bird Day.
Or something.
Anyway, I woke up this morning to the beautiful singing of some red-breasted grosbeaks at my feeder. They were taking turns with the goldfinches.
Then Rebecca and I drove out to Maple Hollow in New Hartford, a wonderful spot for migrants. I hoped to find flycatchers, but there were none to be
found. Instead we found orioles and tree swallows and tanagers, and a gnatcatcher nest and yellow warblers and many other birds. It was a good day.
Rose-breasted Grosbeak |
Anyway, I woke up this morning to the beautiful singing of some red-breasted grosbeaks at my feeder. They were taking turns with the goldfinches.
Goldfinch |
Least Sandpiper |
Then Rebecca and I drove out to Maple Hollow in New Hartford, a wonderful spot for migrants. I hoped to find flycatchers, but there were none to be
Maple Hollow Road |
Gnatcatcher |
Friday, May 9, 2014
Monday, May 5, 2014
Please Don't Exhale
When I started teaching at Hall High School, I found an exercise to help students practice their graphing and analysis skills.
Using data from the Carbon Dioxide Information Analysis Center's sensors on Mauna Loa in Hawaii, the exercise had students graph the monthly average level of CO2 from 1990 through 1995, then consider the changes. What they saw was that while the CO2 levels went up and down every year (plants draw CO2 from the air during the growing season), every year the averages increased.
When I first used the activity in 2005, I decided to use more recent data - and had to create a new graph form. The original form only went up to 370 parts per million. By 2004, levels were already reaching 379 ppm.
In the pre-industrial world, the average CO2 level was around 280 ppm. In 200 years of burning fossil fuels, from 1800 to 2005, we brought it up to 380. It took only 8 more years to bring it up another 20 ppm. The average rate of increase is just under 2 ppm/year.
My last year of teaching, the level reached 400 ppm for the first time (based on studies of glacial ice and ocean sediments) for one day during the month of April 2013.
This year the average CO2 levels for the entire month of April were 401.33 ppm.
This is not good news.
Using data from the Carbon Dioxide Information Analysis Center's sensors on Mauna Loa in Hawaii, the exercise had students graph the monthly average level of CO2 from 1990 through 1995, then consider the changes. What they saw was that while the CO2 levels went up and down every year (plants draw CO2 from the air during the growing season), every year the averages increased.
When I first used the activity in 2005, I decided to use more recent data - and had to create a new graph form. The original form only went up to 370 parts per million. By 2004, levels were already reaching 379 ppm.
In the pre-industrial world, the average CO2 level was around 280 ppm. In 200 years of burning fossil fuels, from 1800 to 2005, we brought it up to 380. It took only 8 more years to bring it up another 20 ppm. The average rate of increase is just under 2 ppm/year.
My last year of teaching, the level reached 400 ppm for the first time (based on studies of glacial ice and ocean sediments) for one day during the month of April 2013.
This year the average CO2 levels for the entire month of April were 401.33 ppm.
This is not good news.
Saturday, May 3, 2014
Warmth and Opportunity
Clearbrook Road in Burlington |
Ferns unfolding |
Ferns are unfolding, skunk cabbage is in full bloom, wood anemones are blooming along the streams, and wild strawberries are starting to bloom!
Skunk cabbage blooming |
The spring migration is in full swing. Birds that spend the winter in South America have started swarming
Wood anemones |
Wild strawberries are blooming! |
north. They will spend the summer stuffing themselves and their babies with insects before heading back south for the winter. Most of "our" birds only spend 5 months here each year.
Yellow birch flowers |
Usually the birds don't reach us until the leaves are out. Then they jump around in the tops of the trees, hiding behind the leaves and taunting us.
Yellow-rumped warbler, exposed. |
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