Today is Blog Action Day ‘09, and this year’s topic is climate change. What better topic for an ecoBlogsphere Watch post? Most of these links come from the last 3 months or so.

Let’s be clear. This isn’t about politics; it’s about facts. Ice doesn’t care how you vote or what you believe, it will melt regardless, as long as it’s above 0 degrees Celsius. Fact: at the current rate of melting versus snowfall, Glacier National Park (USA) will have no glaciers left by 2020. The glaciers of North America’s interior mountains are melting at an astonishing rate (I highly recommend taking the walk to the edge of the Athabasca Glacier to get a sense of how fast it’s happening). This should be a huge concern to citizens of cities like ours that rely on rivers whose source is those glaciers. How will our communities change when glaciers no longer feed those rivers?  Fact: the Arctic pack ice is also disappearing, with the last three summers marking the three lowest extents of Arctic sea ice since 1979, and totally ice-free summer conditions now expected within 20-30 years. And a must-read report on prehistoric carbon dioxide levels using ocean floor sediment samples in this week’s issue of Science may explain why that is happening way faster than previously predicted, and indicates that our current political targets for emissions reduction are probably not stringent enough.

The consequences of climate change will be felt everywhere, in ways we don’t yet appreciate as a society: people are aware that the extinctions of large numbers of vulnerable species is one cost of inaction (save the polar bears!), but tend to think less about human problems like floods, droughts, famines, wars, and refugee migration. Google have used their Maps app to create stunning visuals of how different our planet could look with conservative estimates of temperature changes worldwide and flooding in coastal regions – go watch if you haven’t seen it yet.  The military are already using these when-not-if scenarios as part of their strategic planning, and so are the agribusinesses who’ve led the rush to buy fertile land in Africa, Asia, Eastern Europe, and Latin America.

What can we do? I mean, apart from becoming survivalists living on off-the-grid communes on high ground – good luck to you if that floats your boat, but personally, I like city living.

Well, we can mitigate these consequences by reducing our greenhouse gas emissions and slowing down the rate of global climate change. (We’ve made a change that big before: think of the 1980s ban on chlorofluorocarbons to save the ozone layer. And most experts agree that we have the tools and technologies we need – see TED.com and worldchanging.org – we just need the political will to apply them.) This means asking the Canadian and Albertan governments to kindly stop cowtowing to the interests of multinational businesses (many of whom are already quietly investing in biofuels and renewables), to sign treaties and adhere to them, to create provincial building codes and municipal guidelines that value density and energy efficiency, to work to integrate renewable energy generation as a major component of the grid, and to create programmes to retrain workers and retool industries. Well-drillers can become geothermal experts, and machinists and electricians can learn how to build and install solar and wind microgenerators.

On an individual level, this means becoming engaged citizens, asking tough questions of our representatives (especially here in Oil Country), and making appropriate choices for our families. It means looking hard at our homes and habits, then making honest efforts to do what we can to reduce our environmental impact. Locally, lots of organizations are working to help us do these things – signing up for E-SAGE’s newsletter is a great way to keep abreast of all those groups’ events and projects.

After figuring out what our homes’ and businesses’ carbon footprint is and doing what we can to make it smaller, the best (although still flawed) way to mitigate the effects of our remaining emissions is still to buy carbon offsets – thankfully the David Suzuki Foundation has recently created an independent report on offsets that helps us navigate that minefield and figure out which offsets do the most good.

Am I a total nag? Good. In graduate school, we scientists are taught to use language carefully, to always provide context and not jump to unwarranted conclusions. You don’t ever want to appear alarmist or unprofessional. It’s very difficult training to break. So when I read the statements being made by climatologists, ecologists, and wildlife biologists about climate change and its consequences, I’m startled by their urgency and directness.

We’ve already unwittingly changed the world. Now it’s time to change our course.