Last year was the most perilous ever for people defending their communitys land, natural resources or wildlife, with new research showing that environmental defenders are being killed at the rate of almost four a week across the world. Two hundred environmental activists, wildlife rangers and indigenous leaders trying to protect their land were killed in 2016, according to the watchdog group Global Witness more than double the number killed five years ago. And the frequency of killings is only increasing as 2017 ticks by, according to data provided exclusively to the Guardian, with 98 killings identified in the first five months of this year. John Knox, UN special rapporteur on human rights and the environment, said: There is now an overwhelming incentive to wreck the environment for economic reasons. The people most at risk are people who are already marginalised and excluded from politics and judicial redress, and are dependent on the environment." Most environmental defenders die in remote forests or villages affected by mining, dams, illegal logging, and agribusiness. Many of the killers are reportedly hired by corporations or state forces. Very few are ever arrested or identified. This is why the Guardian is today launching a project, in collaboration with Global Witness, to attempt to record the deaths of everyone who dies over the next year in defence of the environment. We will be reporting from the worlds last wildernesses, as well as from the most industrialised countries on the planet.