Have we reached the tipping point?

Have we reached the tipping point?

Today is a pivotal point in human history. We are now living in the Anthropocene: humans are the main driver of planetary change. We’re pushing global temperatures, land and water use beyond anything our species has experienced before. We’re polluting the biosphere, acidifying the oceans, and reducing biodiversity. At the same time, our global population will grow from seven billion to nine billion by 2050, and all will need food, water and clean air.

As if to illustrate the point further, last month Arctic monitors showed the concentration of carbon dioxide in the atmosphere has passed 400 parts per million (before the Industrial Age, carbon dioxide levels were 275 ppm). New data shows the rate of climate change could be even faster than thought.

Perhaps most worryingly of all, 22 scientists warned last week we are approaching a planetary tipping point, beyond which environmental changes will be rapid and unpredictable. Basing their alarming conclusion on studies of ecological markers from species extinction rates (currently 1,000 times the usual rate, and comparable to those experienced during the demise of the dinosaurs) to changes in land use (more than 40% of land is dominated by humans and we affect a further 40%), these scientists fear we will enter a new, unknown state, and one which threatens us all.

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