There are myriads of ways of changing the world, let every action count, do something small every day:

 
                                      write to your local councillor
                                           smile at people
                                              plant trees
                                                clear out your closets, give your unneeded stuff away.
                                                   pick up litter in a public place.
                                                     plant a food garden
                                                      consider if the salaries you pay are equitable
                                                      donate some money to a worthy cause
                                                    plant fruit trees on your pavement
                                                  sign a petition, with which you are aligned
                                                use a bike or walk instead of driving
                                              play with children
                                            install a solar water heater
                                           buy organic
                                            give money to the beggar
                                               spend time with someone you love
                                                  engage in conversation with someone out of your normal paradigm
                                                     suspend judgement
                                                         recognise yourself in others
                                                            practise random acts of kindness
                                                             make compost
                                                                do some volunteer work
                                                                    become engaged in your local community
                                                                   recognise people and say hi
                                                                  recycle
                                                                trade in your car for something more environmentally friendly
                                                              speak truth
                                                           write to the newspaper
                                                       send blessings to people you pass
                                                   feel equal