Thursday, January 29, 2004
By David Suzuki
Most Canadians are used to life moving at break-neck speed.
We carry cell phones so we can be reached instantly. We use
email so we can transmit text and photos in the blink of an
eye. We eat at fast food chains so we can get our food immediately.
We drive everywhere to get there faster. Once we've made a
decision, we want results — now.
Unfortunately, the rest of life on our planet doesn't work
that way. Things take time. Processes evolve over hundreds,
thousands, or millions of years. As a result, humanity has
no problem messing things up quickly but little patience when
it comes to fixing them.
A perfect example is the ozone layer. Nearly 20 years ago,
scientists discovered a massive hole in the ozone layer, the
protective layer of ozone gas high in the atmosphere that
helps shield all living things from the Sun's harsh rays.
The hole was growing and threatened to cause increased skin
cancer in humans and a host of unknown environmental problems.
Over the next few years, scientists determined the cause
of the problem: a group of chemical compounds called CFCs
that were used in solvents, aerosols, and as coolants in refrigeration
units and air conditioners. When CFCs find their way up into
the stratosphere and react with ultraviolet light, it creates
chlorine free radicals, which are potent scavengers of ozone.
In an unprecedented move, nations around the world quickly
agreed to phase out CFCs and the Montreal Protocol was born.
It is a well-known and unqualified success. As one researcher
points out in a recent edition of the journal Nature, even
schoolchildren today are familiar with the story. Unfortunately,
our instant-fix mentality is so ingrained that many people
are still confused when stories about the ozone hole continue
to appear every year. "Didn't we fix that?" is a
common refrain.
In fact, the Montreal Protocol is working. CFC production
has dropped to near zero levels and the ozone layer seems
to be gradually repairing itself. But CFCs can persist in
the atmosphere for 50 to 100 years. So some of the CFCs manufactured
40 years ago are still destroying ozone today. It will take
decades before the protective layer fully heals. Until then,
the size of the hole will fluctuate from year to year.
Another class of chemicals that will continue to haunt us
for decades, even though a number of them were banned in 2001,
are persistent organic pollutants. These toxic chemical compounds,
which include PCBs, DDT, and dioxin, are easily transported
by air and ocean currents and have found their way into even
the most remote regions of the planet. They did not exist
75 years ago, but today traces of these compounds can be found
in the bodies of every person on Earth. No one knows what
long-term effect these substances are having on our health.
As humanity's influence on the environment and natural systems
continues to grow, we have to remember that it can take far
longer to solve our problems than it does to create them.
We cannot just switch a problem off like a remote-control
television. Global warming, for example, will not be solved
instantly. The carbon dioxide we are pumping into the atmosphere
today will stay in our air for several hundred years. Even
if we stopped producing heat-trapping gases today, the Earth
will continue to warm, and we will continue to have more extreme
weather events and other climate-related problems for generations.
That's why it's so important to get started now. Our planet
cannot be commanded to fix itself. Mother Nature does not
have a cell phone. She doesn't use email, and she's not too
keen on instant messaging either. She takes her time, and
we'd better get used to it because like it or not, we're on
her schedule.
Take the Nature Challenge and learn more at http://www.davidsuzuki.org/
Source: David Suzuki Foundation
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