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If you or co-workers are all-day coffee drinkers, invest in carafes to keep coffee hot instead of leaving the coffee maker on all day. Besides, your coffee will taste better if it hasn't been sitting on the burner.
This would be a repeatable one-month challenge.
Arithmetic isn't my strong point, and neither is calculating electricity use. But here's my math: a standard 900-watt kitchen coffee maker left on for just one hour a day emits nearly 42 pounds of co2 a month:
1 hour x 900 watts = 0.9 kwh.
0.9 kwh x 30 days = 27 kwh.
27 kwh x 1.55 = 41.85 pounds/month.
41.85 x 12 months = 500 pounds of co2 saved in a year.