By Josh Gelernter
Saturday, April 30, 2016
There were two big pieces of news out of NASA this week.
NASA’s Hubble Space Telescope and scientists at the Southwest Research
Institute discovered a new moon, orbiting a dwarf planet named Makemake (one of
the many Pluto-esque bodies that live in the far reaches of the solar system).
And NASA announced that the Earth is getting greener. Literally greener. Plant
growth is way up.
Why is plant growth way up? Because of all the extra
carbon dioxide in the air. According to the study, which was published this
week in the scientific journal Nature,
the total area of the planet that’s covered by plants has increased by more
than 11 million square miles in the last 33 years. For perspective: North
America, including Greenland, is a little less than nine and a half million
square miles. Of course, not all of this increase is due to CO2 and global
warming. But 78 percent of it is. (Says the study.)
This is very good news. Plants feed the world. It is not,
however, unexpected news. Wall Street
Journal readers may recall a piece published in May of 2013 called “In
Defense of Carbon Dioxide,” by William Happer, one of Princeton’s top-flight
physicists, and Harrison Schmitt, a geologist, a former Republican senator from
New Mexico, and an Apollo astronaut who walked on the moon.
“In Defense of Carbon Dioxide” criticized the
“conventional wisdom” about CO2 and the “single-minded demonization of this
natural and essential atmospheric gas.” “Contrary to what some would have us
believe,” wrote Schmitt and Happer, “increased carbon dioxide will benefit the
increasing population on the planet by increasing agricultural productivity.”
Needless to say, they were right on the money.
And this was no shot in the dark — in fact, the benefit
of carbon dioxide to plant life is not only a well-established fact, but
suffocatingly obvious, when you think about it: The (very reasonable, entirely
correct) trope of conservationists is that we need more plants, because we
breathe oxygen and emit carbon dioxide, whereas plants breathe carbon dioxide
and emit oxygen. It follows that plants need carbon dioxide in more or less the
same way we need oxygen. This is why — point out Schmitt and Happer —
commercial greenhouses tend to grow plants in air that is 150 percent richer in
carbon dioxide than the great outdoors.
Schmitt and Happer’s piece also explained that higher
levels of atmospheric CO2 make plants more resistant to drought — basically, by
reducing the number of water-wasting air holes a plant needs to breathe — which
(they say) is why droughts in the age of global warming don’t look like
droughts in the age of the Dust Bowl. And they point out that the current
elevated CO2 levels are still much lower than CO2 levels were in the distant
(pre-human) past.
They add that “variations in global temperature correlate
much better with solar activity and complicated cycles of the oceans and
atmosphere” than they do with increased levels of carbon dioxide. And that
“there isn’t the slightest evidence that more carbon dioxide has caused more
extreme weather.”
Unfortunately, Happer and Schmitt’s good tidings were not
enough to assuage the concerns of environmental opinion-makers. But the fact
that their predictions have been perfectly borne out should give some
ammunition to fighters of the good fight.
And in the meantime, everyone on every side of the
global-warming argument should take a few moments to appreciate these, our
salad days, and — at last — some good news in global warming.
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