I'd heavily tax ALL corporations that make useless stuff and give huge tax breaks to corporations that produce food, educational & health care products instead. I'd create incentives for companies to change over their facilities from creating useless material goods that are repeats of unnecessary products that fill garbage dumps and do not contribute to the betterment of the world.
Further more I'd make sure that food, water, shelter and education and were where the public's tax dollars were spent, and the tax dollars from corporations, which would be taxed appropriately so the heads of these companies could not be paid salaries that could sustain entire countries.
I would also put a cap on the amount of money any one individual could make in a year (corporate managers, athletes, movie stars, politicians etc) and ensure that employees of service industries that contribute to the betterment of the population and the world were the best paid members and workers in our societies (hospitals, schools, care facilities, farmers, etc).
The number one priority would be to make sure that the world population has water, food, education, health care and support from the majority of the population instead of the minority, and to create sustainable communities everywhere that respect the environment, people and animals of this world.
I'd also stop the spending of space exploration, contributions to war efforts and useless committees that are constantly being created to try to change decisions already voted on by the public, until the population of the world was taken care of first.