Last week our planet reached a scary milestone for carbon dioxide, the most important global warming gas. The average carbon dioxide reading exceeded 400 parts per million at the National Oceanic and Atmospheric Administration (NOAA) Mauna Loa Observatory (MLO) on the island of Hawaii for the 24 hours that ended at 8:00 p.m. Eastern Daylight Time on Thursday, May 9, 2013. Earth hasn’t had this much carbon dioxide concentrated in the air for at least three million years, which is before human life on the planet.
This should be a wakeup call that major and potentially catastrophic global weather changes are coming and a sign we’re not doing enough to tackle climate change.
We’ve seen carbon dioxide levels above 400 parts per million in the Arctic last year and even in some hourly readings at NOAA’s MLO. However, this is the first time we’ve seen the average reading for an entire day exceed that level. Carbon dioxide levels do rise and fall along with the seasons. As foliage grows over the summer in the Northern Hemisphere, 10 billion tons of carbon will be pulled out of the air. But it’s only a temporary pardon in a situation that’s becoming direr by the moment.
We simply must invest in alternative energy technologies and begin curbing our dangerous global appetite for fossil fuels. Otherwise, the time will come soon where no measurement of the ambient air anywhere on earth, in any season, will produce a reading below 400.
The official target to limit the damage from global warming is 450 parts per million (PPM), which is generally agreed to be the maximum level compatible with that goal. Our relentless, long-term increases in carbon dioxide emissions are likely get us to 450 PPM in well under 25 years. The time to slow down global warming is dwindling quickly. Twenty five years may seem like a long time, but our planet is huge. It will take more time than that to right the ship.
Not every country has agreed to set binding emissions targets, either. Unfortunately, the United States count among those shirking their responsibility. Now greater efforts are necessary, and are all but impossible without severe economic disruptions.
Can we live on a planet that is warmer and wetter? Probably, but billions of people are going to suffer as we make the transition. It’s a better plan to lower our carbon footprints and speedily move to no and low carbon energy sources. The price is going to be high either way, and it’s only getting steeper as we hurtle towards the point of no return.