By Justin Trudeau - Prime Minister of Canada

Canada is proud to host this year’s World Environment Day. The United Nations General Assembly first designated June 5 as World Environment Day 45 years ago.

By Yolanda Kakabadse - President, WWF International

We are at a crossroads in human history. Our actions are changing the planet in unprecedented ways, and if we carry on as at present the consequences could be disastrous. But, right now, we still have an opportunity to change course.

By David Suzuki - Scientist, broadcaster, author and co-founder of the David Suzuki Foundation, Canada

This amazing, spinning ball of rock and water, hurtling through space at more than 100,000 kilometres an hour, provides us with everything we need to live and be healthy.

By Karma Tshering - Head, Policy and Programming Services, National Environment Commission Secretariat, Royal Government of Bhutan

World Environment Day is very important for Bhutan. We take advantage of it to further enhance awareness of environmental conservation and to bring together communities from all walks of life to show solidarity towards keeping our environment beautiful and healthy.

By Moritz Kraemer - Managing Director and Sovereign Global Chief Rating Officer, S&P Global Ratings

Conditions are conducive to human life in most inhabited areas much of the time, but nature can strike at almost any moment. When severe natural catastrophes hit densely populated and economically developed areas, these rare events bring large economic costs.

By Lü Zhi - Professor, Peking University and Founder, Shanshui Conservation Center

It was a chilly February day. Dangwen and his wildlife monitoring team from the village of Yunta patrolled along the upper reaches of the Yangtze River. The river was frozen solid, easy for poachers to walk over.

By Gunter Pauli - Author of The Blue Economy and Founder of Zero Emissions Research and Initiatives (ZERI)

When I presented core concepts and findings on local economic development as a possible report to the Club of Rome under the title "The Blue Economy: 100 innovations, 10 years, 100 million jobs," in April 2009, I sketched out a vision.

By Beth Rattner - Executive Director, Biomimicry Institute

In 2015, engineering student Jorge Zapote and his team from the University of Calgary decided to take on a problem that affects millions of poor, rural families around the world – and one whose solution could be key to remedying climate change.

By Rachel Kaplan - Emerita Professor of Environment and Behavior, University of Michigan

There was no need to implore our forebears to get outdoors and be in nature. Presumably these ancestors also rarely experienced any gap between what was interesting in their environment and what was important to attend. But the times are ever-changing.

By Richard Louv - Co-founder and Chairman Emeritus of the Children & Nature Network.

To change a society, as the philosopher Ivan Illich wrote, “you must tell a more powerful tale, one so persuasive that it sweeps away the old myths and becomes the preferred story, one so inclusive that it gathers all the bits of our past and present into a coherent whole, one that even shines so