Which of the phrases (1), (2), (3) and (4) given below each statement should be placed in the blank space provided so as to make meaningful and grammatically correct sentence?
Every year Earth Day is being observed on the 22nd April to build support for environmental protection around the world. It aims to encourage people to carry out activities that will benefit the Earth, such as recycling more, using solar power or plant trees. Earth Day celebrations are a way to remind humans of environmental deterioration caused by them and advise them to turn off the electronic devices that are not in use or taking public transport to reduce the emission levels. It recognises that Earth and its ecosystems provide its inhabitants with life and sustenance. ________