The New Oxford American Dictionary’s Word of the Year for 2006 is (drum roll please) Carbon Neutral.
Being carbon neutral involves calculating your total climate-damaging carbon emissions, reducing them where possible, and then balancing your remaining emissions, often by purchasing a carbon offset: paying to plant new trees or investing in “green” technologies such as solar and wind power.
Oxford University Press USA blog - Carbon Neutral: Oxford Word of the Year
This is also a favourite of mine:
elbow bump (a greeting in which two people touch elbows, recommended by the World Health Organization as an alternative to the handshake in order to reduce the spread of germs.)