There are a number of ways in which we can do this. Some of the best ways to do this are captured in the slogan “reduce, reuse, recycle.”
We can reduce the amount of resources that we use on a daily basis. We can do this by turning off lights, by setting thermostats lower in the winter, and by not driving when it is not necessary.
We can reuse things instead of throwing them away. When we buy things like lunch meat in plastic containers with lids, we can later use the containers to store leftovers, for example.
We can recycle things instead of putting them in landfills. This reduces the amount of landfill area that is needed and it also reduces the amount of new resources that must be extracted from the earth.