The average US citizen uses 50 pounds of tissue paper per year. Try to buy the highest content of post-consumer recycled content, looking for either 100% recycled or FSC certified tissue or toilet paper.
Consider switching to e-billing.
In the US, paper products make up the largest percentage of municipal solid waste, and hard copy bills alone generate almost 2 million tons of CO2.
Plant a tree. An average tree can absorb one ton of carbon dioxide over its lifetime.
The average US office worker goes through 10,000 sheets of copy paper per year. Print on both sides and in draft mode whenever feasible.