who to believe on global warming

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If there is one contraversional subject it must be global warming. While everybody agrees that global warming is a reality and we should stop it, the projections differ a lot. I recently read that the sea level is rising already for the longest time. And that a realistic increase in sea level is sixteen inches. Quite a bit lower than Al Gore's 7m. What do you think? Can we still turn the tide by adding more green energy, have programs that reduce CO2 output and replant trees -as we do now- or is doomday irreversible.