Join "Climate Talks for Everyone," this time with distinguished Harvard Kennedy School economist Robert Stavins. There will be an opportunity to ask questions.

Restore the land. Unlock the opportunities. The Republic of Colombia will host this year's event. Desertification, land degradation, and drought are among the most pressing environmental challenges of our time, with up to 40% of all land area worldwide already considered degraded.

The future belongs to the Tropics. The Tropics have just over half of the world’s renewable water resources (54%), yet almost half their population is vulnerable to water stress. Biodiversity is greater in the Tropics – however, loss of biodiversity is also greater in the Tropics than in the rest of the world.

Ride a bike! Celebrate the uniqueness, longevity, and versatility of the bicycle, which has been in use for two centuries. It's a simple, affordable, reliable, clean and environmentally sustainable means of transportation.

Plastic pollution is this year's focus. More than 400 million tons of plastic is produced each year worldwide and 11 million tonnes ends up in lakes, rivers and seas. Refuse, reduce, reuse, recycle, and rethink plastics use.

The ocean's wonder is what draws us in and often drives our desire to protect it. The act of wondering reminds us that we are part of something bigger, wakes us up to our connection to the earth and to each other, expands our understanding of what is possible.

This day celebrates the power of hope in building peace and sustainable development worldwide.

Youth Skills for Peace and Development. Recognize the potential of young people as agents of peace and commit to providing them with the skills and opportunities to address challenges and contribute to a peaceful, prosperous, and sustainable future.