<Table> <Tr> <Th_colspan="2"> Earth Day </Th> </Tr> <Tr> <Td_colspan="2"> Unofficial Earth Day Flag created by John McConnell . The Ecology Flag was also used . </Td> </Tr> <Tr> <Th> Significance </Th> <Td> support for environmental protection </Td> </Tr> <Tr> <Th> Begins </Th> <Td> 1970 </Td> </Tr> <Tr> <Th> Date </Th> <Td> April 22 </Td> </Tr> <Tr> <Th> Next time </Th> <Td> 22 April 2019 (2019 - 04 - 22) </Td> </Tr> <Tr> <Th> Frequency </Th> <Td> annual </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Earth Day </Th> </Tr>

When did the first earth day take place