Earth Day, celebrated annually on April 22, has evolved from a local environmental teach-in to a global phenomenon embraced by over 190 countries. Here are 20 intriguing Earth Day facts you might not know:

Inception: Earth Day was first observed on April 22, 1970, sparked by Senator Gaylord Nelson's vision to mobilize grassroots support for environmental protection.
Global Recognition: Recognizing its significance, the United Nations designated April 22 as International Mother Earth Day in 2009.
Global Reach: From its humble beginnings in the United States, Earth Day has expanded to over 190 countries, involving an estimated 1 billion people annually.
Founding Vision: Earth Day was championed by Wisconsin Governor Gaylord Nelson, who spearheaded environmental policies and initiatives during his tenure.
Teach-In Origins: Senator Nelson's inspiration came from the student-led activism of the 1960s, culminating in the first Earth Day as a nationwide teach-in for environmental awareness.
Earth Day Flag: Designed in 1970 by John McConnell, the Earth Day flag features a stunning image of Earth, taken during the Apollo 10 mission.
Early Environmental Challenges: Even in the 1950s and '60s, pollution and environmental degradation were pressing issues, catalyzing the need for Earth Day.
Rachel Carson's Legacy: Rachel Carson's seminal work, Silent Spring, published in 1962, awakened public consciousness about environmental threats, spurring the modern environmental movement.
Immediate Impact: The inaugural Earth Day catalyzed unprecedented legislative action, including the establishment of the Environmental Protection Agency (EPA) and landmark environmental laws.
Tree-Planting Campaign: In 2011, Earth Day inspired the "Plant Trees Not Bombs" initiative, resulting in 28 million trees planted in Afghanistan.
Shifting Public Opinion: Earth Day was pivotal in shifting public attitudes towards environmental protection, reflecting a 2,500% increase in support within just two years.
Global Expansion: By its 20th anniversary in 1990, Earth Day had gained global traction, with 200 million people participating across 141 countries.
UN Endorsement: The United Nations officially embraced Earth Day in 2000, emphasizing the need for global action on energy and climate change.
Virtual Advocacy: With the advent of the internet, Earth Day activism extended worldwide, facilitating coordination among environmental groups across 184 countries.
Annual Themes: Each Earth Day adopts a specific theme; recent examples include "Planet vs. Plastics," highlighting urgent calls for reducing single-use plastics.
Scientific Support: Earth Day is endorsed by scientists and environmentalists, aligning with broader advocacy for evidence-based policies and protection of scientific research.
Grassroots Impact: Despite its global scale, Earth Day relies on local initiatives to drive meaningful change, fostering community engagement in conservation efforts.
Distinct from Equinox Day: Earth Day, unlike Equinox Day, focuses specifically on environmental stewardship and awareness, celebrated annually on April 22.
Virtual Celebrations: Earth Day embraces virtual platforms to unite global voices in advocating for sustainable practices and environmental protection.
Continued Relevance: As we face pressing environmental challenges, Earth Day remains a rallying point for collective action and a reminder of our shared responsibility to safeguard our planet.

Sabrina Conte