Protect nature to combat climate change
As ecosystems falter, species large and small will come increasingly under strain, and will need to adapt or perish.
The world is at a crossroads. The future of life on our planet - and thus our own - is in jeopardy. Humanity has overreached in its pursuit of affluence. Research shows that we have altered more than 75 per cent of the world's ice-free land.
Over half of the planet's habitable surface is now used to produce food, with wildlands constituting less than 25 per cent of earth. The ocean has fared no better.
In the last hundred years, 90 per cent of large fish have been removed from the sea, with 63 per cent of stocks overfished.
Making matters worse, greenhouse-gas emissions from industry, agriculture, and deforestation have increased significantly since 1970. With human-driven global warming accelerating, we can no longer ignore the loss of natural areas or the threat of climate change. We already know that if land conversion and GHG emissions are not reduced by 2030, it will be impossible to limit global warming to 2°C above pre-industrial levels, as envisioned in the 2015 Paris climate agreement.
Moreover, even warming of 1.5°C would pose a grave threat to the planet's biology, accelerating a sixth mass extinction that is already underway. As ecosystems unravel, the quality of life for all species, including humans, will diminish.
When ecosystems are compromised, the natural goods that they provide - clean air and water, crop pollination, and storm protection - inevitably will decline.
Studies show that declining access to clean water and intensifying storms and droughts related to climate change could displace 100 million people just in the next 30 years.
Humans will not be the only ones to suffer in a warming world. After all, we share the planet with around nine million species of plants and animals. As ecosystems falter, species large and small will come increasingly under strain, and will need to adapt or perish. Many will go extinct, whereupon it will take millions of years for earth to recover its breadth and depth of biodiversity. With the planet fundamentally and irreversibly changed, the implications for humanity itself would be immediate and far-reaching.
To prevent such a scenario, we first must remember that the 2015 Paris climate accord was always a half-deal: it addresses the causes of global warming, but not the threat to natural systems upon which all life depends. Today, only 15 per cent of land and 7 per cent of our oceans are protected. Yet studies show that by 2030, we must protect twice as much land and four times as much ocean just to secure essential ecosystems and avoid the most catastrophic effects of climate change. Protecting natural areas is the missing link to maintaining prosperity in a warming world.
In anticipation of the UN Convention on Biological Diversity summit in Kunming, China, later this year, scientists and other stakeholders have developed the Global Deal for Nature. As a time-bound, science-driven plan to protect 30 per cent of land and water by 2030, the Global Deal is a stepping stone to conserving 50 per cent of the earth in a natural state by 2050. In the next decade, we need to achieve more in terms of conservation than we have accomplished over the past century.
Reaching this goal requires a rapid and collective acceleration of conservation efforts.
Just as important as the amount of protected land and water is the diversity and health of natural areas. Land-based protections must safeguard the ecosystems required to support threatened species, mitigate climate change, and safeguard biodiversity. And in the ocean, avoiding species collapse and maintaining sustainable fisheries requires comprehensive protections for critical habitats, threatened species, and migratory corridors.
Although the task is daunting, protecting 30 per cent of land and water by 2030 is eminently achievable. Sceptics will argue that we need to use the land and oceans to feed the projected ten billion people who will share the planet by 2050, and that the proposed protections are too expensive or challenging. But research already shows that the 30 per cent goal is attainable using existing technologies within existing consumption patterns, provided that there are shifts in policy, production, and expenditures by governments.
We have one chance to get this right. Protecting a much larger share of the natural world is an ambitious goal. But it is one that will secure a vibrant future for humanity and all the species with which we share this planet. The Global Deal for Nature, together with the Paris agreement, can save the diversity and abundance of life on Earth. Our very future depends on rising to the challenge.
- Project Syndicate
Enric Sala is Explorer-in-Residence at the National Geographic Society