Every year on Earth Day — April 22 — people come together to raise awareness about environmental problems

This year we will focus on accelerating the transition to a prosperous green economy

During the event, also known as International Mother Earth Day

People in 190 countries take part in activities that often include planting trees, removing litter from land and water sites

As curtailing climate change remains at the forefront of the global environmental agenda

Earth Day this year focuses on a business aspect of that goal: investing in our planet.

Companies that don't go green face a "giant risk"

For Mann, Earth Day is also a reminder that polluters who deny climate change are no longer credible.