Your graph shows a +1 C change in temps since 1850.
It doesn't show whether this was from man-made activity, nature, solar activity, environment, or just plain old normal cycle of Earth's warming and cooling. No one is disputing that it is 1C warmer now than 1850, but that is not going to cause catastrophe, it never has before-- but even if it does, there isn't a lot man can do to prevent it, because man's contribution to it is nominal!
I have maintained all along, if the polar icecaps melted completely, and cause flooding of property along the coasts, etc., as the 'Warmers' suggest... it would have long-since, destroyed the convective currents of our ocean, which would cease to work, turning our oceans into stagnant ponds uninhabitable by any aquatic life to speak of, and weather would be going off-the-chart crazy by then. The last worry anyone would have, would be what to do about coastal flooding!