On 22 April we celebrate Earth Day as a continuation of a more than forty years of environmental movement worldwide. This day is also the occasion to stress the climate emergency while calling for bold, creative, and innovative solutions. Public engagement is key to unlock the full potential of these innovative solutions and accelerate the environmental transition. In this view, the topic of citizen science is a growing in importance as it promotes the active engagement of the public in scientific research tasks.
Several COST Actions are already investigating the potential of citizen science and others are using it within their work programmes to broaden their input.