Earth Day 2021, after a year of lockdown, many have happened. (Photo : Pixabay) We've seen what happens to the world when all of its inhabitants are unexpectedly stuck inside and after more than a year of lockdown, emissions fell (at least temporarily), animals returned to cities (though not all creatures took advantage of the newfound freedom), and everyone discovered what happens when the world is a little quieter. We've seen a new world; now it's just a matter of putting it into practice. Fortunately, the brilliant minds of our generation managed to develop a plethora of ways to aid the planet.