Image source, Getty Images
By Mark Poynting & Maddie Molloy
BBC News Climate & Science
Every year, millions of group crossed nan globe stitchery to people Earth Day and observe nan biology movement.
The arena began successful 1970 successful nan United States, and is now marked astir nan world.
What is Earth Day and erstwhile is it?
Earth Day is simply a world arena which intends to item nan value of protecting nan environment.
It takes spot annually connected 22 April.
It was group up successful 1970 by Gaylord Nelson, a US legislator and environmentalist, and Denis Hayes, a postgraduate student astatine Harvard University.
Both had increasing concerns astir biology harm successful nan US, specified arsenic that caused by a ample lipid spill successful 1969 successful Santa Barbara, California.
They came up pinch Earth Day arsenic a measurement to prosecute nan nationalist and push greenish issues to nan nationalist agenda.
Image source, Getty Images
Even nan first Earth Day attracted ample crowds, specified arsenic these successful Philadelphia, Pennsylvania
The first Earth Day saw 20 cardinal group crossed nan US return to nan streets.
It became a world arena successful 1990, and now involves much than 1 cardinal group of each ages successful astir 200 countries, according to organisers.
"Celebrating Earth Day is often nan first biology action for a batch of people," said Earthday.org president, Kathleen Rogers.
What is happening for Earth Day 2025?
The charismatic taxable for 2025, "Our Power, Our Planet", focuses connected renewable energy.
Previous events person covered a scope of biology issues, including ambiance change, integrative contamination and type protection.
This year, nan organisers are calling for worldwide energy procreation from renewable sources - specified arsenic upwind and star - to triple by 2030.
This is akin to a promise agreed astatine nan COP28 world ambiance convention successful 2023 to triple nan capacity of renewables by 2030.
Renewables person been increasing quickly, but are somewhat disconnected way to meet that promise, nan International Energy Agency said successful October.
Earth Day sees various section events return spot successful summation to nan charismatic theme, specified arsenic clean-ups of beaches, rivers and different spaces.
What has Earth Day achieved?
Within a fewer years of nan first Earth Day successful 1970, nan US Environmental Protection Agency had been group up, and respective biology laws - specified arsenic nan Clean Air Act - had been established aliases importantly strengthened.
More caller events person included planting hundreds of millions of trees, supporting farmers pinch sustainable agriculture practices, and starting ambiance literacy projects astir nan world.
Some observers besides mention nan value of Earth Day successful pushing biology issues backmost up nationalist and world agendas.
"With a big of issues driving our biology challenges down society's privilege list, events for illustration Earth Day punctual america of nan semipermanent costs of short-termism," said Yvo de Boer, erstwhile UN ambiance chief.
In 2016, Earth Day was symbolically chosen for nan charismatic signing of nan landmark Paris ambiance accord, which had been agreed successful precocious 2015.
It was nan first clip that countries of nan world had collectively agreed targets to effort to limit world warming.
What do critics opportunity astir Earth Day?
Some critics pass that these achievements springiness a mendacious consciousness of progress.
Many biology indicators - from global temperatures to species extinctions - are changing quickly owed to quality activities. Efforts to day person fallen acold short of halting aliases reversing these trends.
Some individuals and companies person besides been accused of utilizing Earth Day arsenic an opportunity to misleadingly beforehand their biology credentials, without making nan existent changes that are needed.
This is known arsenic "greenwashing".
For example, campaigner Greta Thunberg posted successful 2022 that Earth Day "has turned into an opportunity for group successful powerfulness to station their 'love' for nan planet, while astatine nan aforesaid clip destroying it astatine maximum speed".
"We each cognize greenwashing is happening and it is infuriating," Earth Day organiser Ms Rogers told BBC News.
"It's not an rumor we've caused, but we cognize Earth Day is utilized cynically by immoderate businesses to [mis]use nan ethos of sustainability for their ain gain."
"Governments request to return robust action and ace down connected immoderate business aliases manufacture lying to consumers."