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From skiers in New Zealand spelling out “350” on a snow-covered slope to Greenpeace-led marchers crossing the Brooklyn Bridge in New York City, on Saturday people across the globe took part in on the International Day of Climate Action. The folks at 350.org coordinated the event; the number refers to the concentration of carbon in the atmosphere that scientists have determined is the safe limit: 350 parts per million. The current level is 387 parts per million, which means we’ve got some serious work to do. Today’s global show of support for the target is aimed to urge world leaders to take immediate steps to address climate change and reduce carbon emissions. Currently, the US Senate is debating , and countries are gearing up for the UNmate Change Conference in Copenhagen in December.

Julie Leibach and I joined the crowd that marched across the Brooklyn Bridge. Among the participants were Suvival Balls, global-warming suits created by The Yes Men—the environmental and corporate ethics activist group whose new movie, “,” is in theaters now. It’s also the group that pulled a press conference against the U.S. Chamber of Commerce last week…a hoax that, among others, Fox News fell for: Check out the video below.