what was the theme of national science day celebrated on 28 february 2017
National Science Day The theme of the year 2017 was "Science and Technology for Specially Abled Persons"[2]
Earth Day The first Earth Day celebrations took place in two thousand colleges and universities, roughly ten thousand primary and secondary schools, and hundreds of communities across the United States. More importantly, it "brought 20 million Americans out into the spring sunshine for peaceful demonstrations in favor of environmental reform."[14] It now is observed in 192 countries, and coordinated by the nonprofit Earth Day Network, chaired by the first Earth Day 1970 organizer Denis Hayes, according to whom Earth Day is now "the largest secular holiday in the world, celebrated by more than a billion people every year."[15] Walt Kelly created an anti-pollution poster featuring his comic strip character Pogo with the quotation "We have met the enemy and he is us" to promote the 1970 Earth Day. Environmental groups have sought to make Earth Day into a day of action to change human behavior and provoke policy changes.[16]