# 使用装饰器模式组合存储（同时写入DB和CSV）
栈（stack）是先进后出的数据结构。单调栈在入栈时通过一定规则保持栈内元素有序（单调递增或单调递减），从而把「找左侧/右侧第一个更大/更小元素」从 O(n²) 降到 O(n)。
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"I don't mind CCS on those sectors where emissions are truly hard-to-abate or impossible-to-abate," says Helene Hagel, head of climate and environmental policy at Greenpeace Denmark.