Recycling is one of the easiest things you can do. Given all the plastic that's around in the world, it's easy to pick up another plastic bag at a supermarket. But it's even easier to be prepared with your own, more sustainable bag. Plastic will continue to have its place in our world, but that makes it that much more important that we strive not to add to its pollution.
The environment gives so much to us, planting is the best way to give back. Not just to the environment, but to ourselves too. From absorbing carbon emissions to just adding to a nice view in a park, nature is surely more than a breath of fresh air. Planting, even just taking care of a small tulip, will brighten your environment, and in turn everyone else's.
This is more of a mindset than a method or clear-cut action to take, but it is the most important part of helping the environment - arguably because it's not only benefitting nature, but also yourself. Using what you already have and making the most of it instead of making a purchase for something new will help you be kinder to nature - and your wallet.
This link will provide you with a lot more information on the effects that human industry have on the environment.
For more information regarding action that we can take in order to better the environment for ourselves and for others.