For those of us who work towards a more sustainable future- and, thankfully, that’s a quickly growing demographic- the challenge is in opening our eyes to the gravity of our situation while maintaining a healthy dose of optimism. With all the doomsday reports, it’s sometimes difficult to see our way out of the mess we’ve created.

I once asked Roger Lang, a remarkable conservationist and entrepreneur out in Montana, whether he thought of optimism as a vital component of the environmental movement.  “I don’t think so,” he replied. “I have dark days when I’m convinced developers will pave all these beautiful open spaces. But I think these bouts of pessimism actually keep me engaged- pure optimism is synonymous with naivete. I think to be dedicated to conservation means you better have a good appreciation of the challenges, or else you’ll be blind-sided by them.”

A new study by researchers at the Yale School of Forestry & Environmental Studies provides, perhaps, the right balance of realism and optimism. An analysis of 240 independent studies, it found that most polluted or damaged ecosystems worldwide can recover within as little as 5 to 10 years “if societies commit to their cleanup or restoration.”

The Yale researchers studied seven ecosystem types and their recovery from man-made disturbances (logging, mining, oil spills, overfishing, industrial pollution…) and natural disasters (hurricanes, cyclones…). They found, for example, that forest ecosystems recovered in 42 years on average, while ocean bottoms recovered in less than 10 years. While the damages to these ecosystemss are serious, the researchers see the results as an indication that “if societies choose to become sustainable, ecosystems will recover. It isn’t hopeless.”

The study does conclude that about 15% of damaged ecosystems are beyond recovery. But the researchers suggest that, as bad as things are,  “speculation that it will take centuries or millennia for degraded ecosystems to recover” is, in general, wrong. Holly Jones, one of the study’s co-authors added, “we recognize that humankind has and will continue to actively domesticate nature to meet its own needs. The message of our paper is that recovery is possible and can be rapid for many ecosystems, giving much hope for a transition to sustainable management of global ecosystems.”

[Sources: Yale University, Jeff Kart- Clean Technica]