350 means safety from the climate crisis.

To preserve our planet, scientists tell us we must reduce the amount of CO₂ in the atmosphere from its current level of 392 parts per million ("ppm")to below 350 ppm. But 350 is more than a number—it's a symbol of where we need to head as a planet.

At 350.org, we're building a global grassroots movement to solve the climate crisis and push for policies that will put the world on track to get to 350 ppm.

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Read more about the science behind 350.