Today is Blog Action Day, an annual event that happens every October 15. Blog Action Day unites bloggers all over the world to blog about a vital issue that the entire global population faces together. This year’s theme is climate change.

Powered by Change.org, Blog Action Day is a chance for every blogger to reach millions of viewers and be heard. The goal is to get people talking, interacting, and sharing information for an important discussion. From commentary to opportunities to take action, news coverage to letters to leaders, there is something that everyone in every blog genre can cover.

Blog Action Day’s website states that by focusing on one topic for the day, all over the globe, “the blogging community effectively changes the conversation on the web and focuses audiences around the globe on that issue.” Whether your blog is about video games, air travel, politics, or a simple online diary, you can still cover this issue and relate it to your own blog.

And hundreds of people are already taking part. From private citizens to prominent leaders to major organizations—from UK Foreign Minister David Miliband to Mother Jones magazine to Oxfam America—hundreds of blogs have already been written and are being shared right now. Can you add yours?

If you’re interested, you can register your blog here to be a part of Blog Action Day.  It will then be featured on the website for people all over the world to read.

For topic ideas and inspiration, you can brows the blogs already on the Blog Action Day homepage. Here are a few ideas you might want to consider…

• Causes of climate change and how they can be curbed
• Climate change resources people may want to check out (films, books, websites)
• Top climate change organizations, their histories, and how they have made an impact—or how to help them make an impact
• Places to volunteer to help stop climate change
• How to make a global warming display for your school, library, or community event
• How to raise money for an environmental organization
• How climate change could impact the world at large
• Explore how climate change is caused by the richer countries, but may have more of a significant impact on poorer countries
• How climate change has impacted your region

Once you have your blog live, feel free to leave a link to it here.