There are many ways to protect the earth. Recycling is one significant way to conserve our resources and protect the earth. Limiting the burning of fossil fuels, reduction of tree use, and planting trees are additional ways of protecting our planet.
The benefit of protecting the planet is that we will be able to live more comfortably on it. If we protected the planet it would not continue to heat up. Our water would be cleaner, as would as air and soil.
There are dozens of ways to protect the Earth, not only including your own actions of conservation, recycling, and limited driving, but how you teach and raise your children if or when you have any to do the same throughout their lives. Not having children is yet another way.
In a larger sense though, consider the effect of pushing for national legislation and international agreements that protect the Earth on a bigger scale. Limits on carbon emissions, pollution treaties and cleanup agreements, protected habitats, national parks, etc. all are good national and global ways to make a big difference.
Lastly, you can join organizations whose sole purpose is to protect the environment. I've included links to a few below.
One major way to protect the Earth is by recycling. Many people do not recycle. It has many benefits such as cutting down on waste materials and reusing materials.
Pollution also contributes to an unhealthy Earth. One major cause of pollution is industry. There are many guidleines in place that control what factories can release in terms of pollution. I am sure that there are ways to improve the amounts of pollution released into the air.
Another way to protect the Earth is by protecting habitats and the species that live there. Forests are being cut down and rivers and oceans are being polluted.
Fuels contribute to another way we can protect the Earth. For example, there are many cars available that are powered by electricity. Using these kinds of cars cuts back on the use of non renewable resources.
Protecting the Earth benefits us because as human beings we have no other place to live. We have to keep the planet in a condition that allows us (and there are so many people on the planet now) to live and prosper. That means we need it to not get too warm for our crops to grow and we need it not to get so polluted as to make us ill.
As to how we can protect it, there are many ways. But I would think that the most important way is not to be wasteful. We need to use the least possible amount of resources by using our intelligence to come up with ways that we can conserve.