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Remaining Time: 1 hour, 23 minutes, 36 seconds. Question Completion Status: Moving to another question will save this response. estion 4 At the beginning of the industrial revolution in 1850, the CO₂ concentration was 280 ppm. Today, it is 420 ppm. 1) If CO2 concentration reaches 500 ppm, how much extra radiative forcing is the Earth's surface receiving, relative to 1850? 2) What is the equivalent temperature change? AF (Wm-2)= a In(C/Co), AT(K) = A'AF a 5.35, A=0.8 per (Wm2) For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS Paragraph V Arial 10pt 111 111 > A У 2 V I. X 1. 0 on huma S