Connecting people across continents. Delivering breaking news. Enabling government transparency. Facilitating social revolutions. Stopping global warming?

The Internet is capable of doing so much, but perhaps the idea that it can help rescue the planet from runaway global warming comes as a surprise to you.

Every time we post a Facebook status to our friends, watch the latest episode of our favorite show on Netflix, or tweet to our followers, that information is housed in giant data centers which require a lot of electricity. These data centers are a key part of the cloud, and a single one can require as much energy as a medium-sized city.

If cloud computing were a country, it would rank sixth in the world on the basis of how much electricity it uses, and the amount of data shuttling around the world is expected to triple in the next few years as more and more people get connected.

The internet has helped to move the world to more freedom, transparency & democracy. It's only natural that it moves the world to a clean energy revolution that will last for generations to come.

The Internet we love, and the companies that run it, are at a crossroads in terms of where their energy comes from. Many of these companies have already chosen the road to a green internet and a sustainable future. Facebook, Apple and Google have committed to 100 percent renewable energy, in response to users around the world who have asked them for a greener internet. Other fast-growing technology companies, like Salesforce, Rackspace and Box, have joined them in making the same commitment, proving that 100 percent renewable energy is 100 percent possible for any company with the will.

By contrast some of the most popular online companies, including social media sites that we use every day like Twitter, Pinterest and Tumblr, still power their platforms with fossil fuels and nuclear energy. The largest cloud company currently is Amazon Web Services, a division of Amazon.com, and hosts the data for some of the most popular online brands in the world. But unlike other major online brands like Google and Apple, Amazon is still primarily powering its digital empire with the dirty sources of energy that threaten our communities and our climate. Of course, Amazon doesn't have to remain stuck in the energy sources of the 1800s. Energy sources like wind and solar made up for more than half of all the new electricity in the United States in 2012.

Meanwhile digital pioneers are making our world greener, both online and offline. Apple is operating the largest privately owned solar installation in the U.S. at one of its data centers. Facebook pushed a U.S. power company to supply its data center with 100 percent wind energy. Google has pioneered the use of clean power purchases, buying wind energy to provide electricity for its services like Gmail and YouTube, as well as the rest of the power grid.

If Amazon and others want to stay innovative and relevant, it's high time they made the switch to the abundant, sustainable, renewable energy of today.

Simply put, we need a greener online to preserve a greener offline.

The Internet has helped move the world to more freedom, transparency and democracy. It's only natural that it moves the world to a clean energy revolution that will last for generations to come. These companies can make that happen, but only if they hear from you.

Join me in asking our favorite Internet companies to commit to 100 percent renewable energy for their data centers.

Kumi Naidoo is the Executive Director of Greenpeace International.