Guess what CO2 is good for trees. RESEARCHERS PUMP EXTRA CO₂ INTO AN OAK FOREST AND DISCOVER TREES WILL BE 'WOODIER' IN FUTURE; AFTER WE INCREASED CO₂ LEVELS TO WHAT WILL BE THE PLANETARY LEVEL IN THE 2050S, TREES TOOK MORE OF IT FROM THE ATMOSPHERE AND THEIR WOOD PRODUCTION INCREASED BY 10%.