Is there a biodiversity Crisis?

Yes. It’s very serious, and it needs to be urgently tackled.

Starting with the natural and land sea carbon sinks mentioned above. They are being degraded, with examples including the deforestation of the Amazon and the disappearance of salt marshes and mangrove swamps, which remove large amounts of carbon. The way we use the land and sea is one of the biggest drivers of biodiversity loss. Since 1990, around 420 million hectares of forest have been lost through conversion to other land uses. Agricultural expansion continues to be the main driver of deforestation, forest degradation and forest biodiversity loss.

Other major drivers of species decline include overfishing and the introduction of invasive alien species (species that have entered and established themselves in the environment outside their natural habitat, causing the decline or even extinction of native species and negatively affecting ecosystems).

These activities, UNEP has shown, are pushing around a million species of plants and animals towards extinction. They range from the critically endangered South China tiger and Indonesian orangutans to supposedly “common” animals and plants, such as giraffes and parrots as well as oak trees, cacti and seaweed. This is the largest loss of life since the dinosaurs.

Combined with skyrocketing levels of pollution, the degradation of the natural habitat and biodiversity loss are having serious impacts on communities around the world. As global temperatures rise, once fertile grasslands turn to desert, and in the ocean, there are hundreds of so-called “dead zones”, where scarcely any aquatic life remains.

The loss of biodiversity affects the way an ecosystem functions, leading to species being less able to respond to changes in the environment and making them increasingly vulnerable to natural disasters. If an ecosystem has a wide diversity of organisms, it is likely that they will not all be affected in the same way. For instance, if one species is killed off then a similar species can take its place.