We got here not by one big move. It took a long time, poor information and many small choices. Companies made money by convincing people to be unthinking consumers. On macro scale, you cannot do much except be informed and vote. If everybody bought green, corporations would have to follow the consumer’s spending habits to make profits.
On a personal level, you can grow a garden, plant edible landscape and edible perennials wherever you can. You can buy the most efficient and durable cars, appliances and clothes. If possible, you can choose live in areas that do not depend on massive use of energy for heating or cooling.