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THE ECOLOGICAL DIMENSION OF PHOTOVOLTAICS 49<br />

[ppm]<br />

1000<br />

900<br />

800<br />

700<br />

600<br />

500<br />

400<br />

300<br />

200<br />

100<br />

0<br />

1000 1200 1400 1600<br />

(a)<br />

Direct<br />

measurements<br />

Ice core data Projections<br />

0<br />

1800 2000 2100<br />

1000<br />

900<br />

800<br />

700<br />

600<br />

500<br />

400<br />

300<br />

200<br />

100<br />

[ppm]<br />

Scenarios<br />

A1B<br />

A1T<br />

A1F1<br />

A2<br />

B1<br />

B2<br />

IS92a<br />

Observations. Northern Hemisphere,<br />

proxy data<br />

Departures in temperature in °C (from the 1990 value)<br />

6.0<br />

5.5<br />

5.0<br />

4.5<br />

4.0<br />

3.5<br />

3.0<br />

2.5<br />

2.0<br />

1.5<br />

1.0<br />

0.5<br />

0.0<br />

−0.5<br />

−1.0<br />

Global<br />

instrumental<br />

observations<br />

Projections<br />

Several models<br />

all SRES<br />

envelope<br />

Scenarios<br />

A1B<br />

A1T<br />

A1F1<br />

A2<br />

B1<br />

B2<br />

IS92a<br />

Bars show the<br />

range in year<br />

2100<br />

produced by<br />

several<br />

models<br />

1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100<br />

(b)<br />

Figure 2.4 Past and future CO 2 atmospheric concentrations (a) and variations of the Earth’s surface<br />

temperature (b). Time span: year 1000 to year 2100. The projections on the right sides are<br />

based on scenarios of the Intergovernmental Panel on Climate Change (IPCC) [4]. Reproduced by<br />

permission of Cambridge University Press

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