miserably belated earth day

i missed earth day. i was driving a station wagon around the city. but the day before i went to www.gocarbonzero.org and found out that for $73 dollars they would plant 13 trees to offset the amount of carbon dioxide i put into the atmosphere each year. would it be pretty much the same thing if i buy a wood coffee table from craigslist, well same spirit + i get something.