Editor's Note: This guest post was written by Mette Lykke, co-founder of www.endomondo.com, the sports community where Run for Hopenhagen’s registration of miles takes place.

Whenever you go for a run in 2009, you can donate your miles to the Hopenhagen campaign. So far, runners have donated more than 11,000 miles and we’re just getting started.

“How does running help the climate?” one might ask. We are of course aware that running is not really a transport substitute for most of us, but we like the idea of showing support to the climate cause while at the same time leading a healthy life. The energy that you get from a great run is exactly what we need now to start building a more sustainable future. In other words, running gives us hope.

That’s why we got involved in ‘Run for Hopenhagen’ and why we’re urging you to join - even if you don’t find running to be a lot of fun. If you need motivation to start running, knowing that your miles actually matter might just do the trick. And if not, maybe technology will.

When participating in Run for Hopenhagen you have the opportunity to register your miles simply by entering them into a formula, by tracking them with a Garmin device or by tracking them with a GPS mobile.

Either way, you get a full training log here  for free. You also get to challenge others and to follow the training of your friends – even in real-time if they track their run with a mobile phone.

Sign up to the campaign now at www.runforhopenhagen.org!

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Endomondo is a free site based on real-time tracking of distance based sports with a GPS mobile phone. The site also allows import of data from Garmin devices in addition to manual entering of data. The vision is to make sports more fun, and based on a full personal training log, users can challenge each other and follow the friends currently working out live. The system has been used for real-time tracking of several large sports events, lately the Copenhagen Marathon. Prior to co-founding Endomondo, Mette worked for McKinsey & Company as a management consultant.