能源系统建模：GCAM碳中和情景设置

GCAM可以设置碳排放总量约束，以下是示例的.xml文件，我们把它用来做2060中国碳中和情景设置：

<scenario name="NetZero60">
	<world>
        <!-- China reaching net-zero by 2060-->	
		<region name="China">
			<ghgpolicy name="CO2">
				<market>China</market>
			<constraint year="2020">3125.24305</constraint>	
            <constraint year="2025">2734.587669</constraint>
            <constraint year="2030">2343.932288</constraint>
            <constraint year="2035">1953.276906</constraint>
            <constraint year="2040">1562.621525</constraint>
            <constraint year="2045">1171.966144</constraint>
            <constraint year="2050">781.3107625</constraint>
            <constraint year="2055">390.6553813</constraint>
            <constraint year="2060">-1.1</constraint>
            <constraint year="2065">-1.1</constraint>
            <constraint year="2070">-1.1</constraint>
            <constraint year="2075">-1.1</constraint>
            <constraint year="2080">-1.1</constraint>
            <constraint year="2085">-1.1</constraint>
            <constraint year="2090">-1.1</constraint>
            <constraint year="2095">-1.1</constraint>
            <constraint year="2100">-1.1</constraint>
			</ghgpolicy>
		</region>
	</world>
</scenario>

region设置为中国表示中国的排放约束 ghgpolicy设置为CO2表示对CO2的排放约束 constraint表示总量约束 market设置成中国，表示中国与其他地区的碳市场是分隔的。

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