As shown in Figure 2.18: the atmospheric concentrations of methane and nitrous oxide have increased in the last several decades. Determine and discuss some of the reasons for this increase.

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CO₂ (ppm) 99 360 320 280 240 200 -360 -380 -400 -420 -440 டடம் mamada parte din www импати 600 500 pa M What ............. 100 3:20 280 240 200 (qdd) O³N 400 300 200 Time (thousands of years before present) Figure 2.18 Atmospheric concentration of some greenhouse gases over the last 650,000 years [19]. 1600 1400 1200 1000 8:00 600 400 CH4 (ppb)