Emissions from the stuff you throw away? How does that work? Landfill sites emit thousands of tonnes of greenhouse gases every year, mostly methane, which makes them all the more potent. The largest source of these emissions is organic matter, so starting a green team at work to make things like composting happen can make a big difference.
Take the recycled option
Recycling significantly extends the useful fiber life of trees. Since the fibers for some kinds of papers, such as printing & writing, can be recycled seven or more times, a tree that is used for papermaking is most efficiently and fully used when those fibers are recycled as many times as possible. That also reduces the need to cut new trees for papermaking.