They showed that 350 parts per million CO2 in the atmosphere is the safe limit for humanity.
The bad news is we’re already past that number – we’re at 390 parts per million, which is why the Arctic is melting, why drought is spreading across the planet, why humanity is facing perhaps its greatest challenge ever.
The good news: that number gives us a target to aim for.
If you’re free Saturday between 8am and 3pm, join in the activities for the International Day of Climate Action, beginning with the aerial photograph (using a boom lift, not a fuel guzzling helicopter or other aircraft) of hopefully hundreds of people forming the number 350 at Hong Lim Park.
More details of the day’s activities can be found here.