The environmental activist who helped establish Earth Day is John McConnell. He proposed the first Earth Day celebration in 1970 as a way to promote appreciation for the Earth and environmental protection. This grassroots movement inspired millions to engage in environmental advocacy, reaching a global audience. McConnell's vision emphasized respect for the planet and human responsibility in preserving its resources. Earth Day has since evolved into an annual event celebrated around the world, emphasizing environmental education and conservation efforts. McConnell’s efforts have left a lasting impact on raising awareness about environmental issues and mobilizing collective action for a sustainable future.