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You can include the following key points in your speech;

•    Earth day is celebrated to save the planet earth every year on 22nd April.
•    Various programs are organized to educate people about protection of the environment.
•    Today schools, colleges, universities and many government organizations take part in Earth day and actively take measures to protect the earth.
•    More than 190 countries are now participating in Earth day.
•    You too can take simple measures in your household such as putting off lights, stop wastage of water, etc.