An Internet campaign spearheaded by former US vice president Al Gore to raise awareness about climate change began airing its day-long broadcast around the world on Thursday.

The project, called "24 Hours of Reality," features a multimedia presentation viewable online that showcases how extreme weather events like floods, fires and storms are linked to climate change.

By 1300 GMT, the live-streamed broadcasts delivered in 13 languages, viewable at climaterealityproject.org, had drawn more than three million views, organizers said.

The hourly broadcasts are scheduled in various locations around the world, including Beijing, New Delhi, Jakarta, London, Dubai, Istanbul, Seoul and Rio de Janeiro.

They also aim to reveal how money motivates those who deny that human-driven pollution is contributing to climate change.

"Around the world, we are still subjected to polluter-financed misinformation and propaganda designed to mislead people about the dangers we face from the unfolding climate crisis," Gore said in a statement.

Celebrity actresses Renee Zellweger and Fran Drescher were added to the roster of appearances for Thursday beginning at 1600 GMT.

The campaign ends with the final presentation by Gore starting at 7:00 pm (2300 GMT) in New York.

Gore won the 2007 Nobel Peace Prize for his efforts on climate change.

A slideshow presented by Gore about the dangers of climate change was the basis of the popular 2006 documentary "An Inconvenient Truth," which grossed 49 million dollars worldwide.