World Habitat Day is celebrated on the first Monday of October in many countries around the world. The aim of this day is to warn of the problems of rapid urbanization and its impact on the environment and human poverty. It was officially defined by the United Nations and first celebrated in 1986.

World Day of Architecture is celebrated on the first Monday of October.

World Animal Day is dedicated to the animals. This date was originally chosen because it is the feast day of Francis of Assisi, a nature lover and patron saint of animals and the environment. Many churches all over the world observe the Sunday closest to 4 October with a blessing for the animals.

Susan Sarandon (an American actress, social activist) was born in New York in 1946.

Alicia Silverstone (an American actress, environmentalist, animal rights activist) was born in California in 1976.