王书肖表示，根据清华大学团队此前的测算，如果全国PM2.5浓度要降到25微克/立方米以下，主要大气污染物的排放量还需下降30%左右。随着我国治理行动步入深水区，末端治理减排的空间越来越小，更依赖源头治理——即转变社会经济发展方式，实行能源结构调整、产业结构升级和交通运输结构清洁化等。
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The rapid climb didn’t happen overnight. Interest costs have surged due to a one-two punch: the federal debt load has ballooned by trillions, while interest rates climbed sharply from near-zero post-pandemic lows. As a share of the economy, interest costs have doubled from 1.6% of GDP in 2021 to a record 3.2% in 2025. Today, the government already spends more on debt interest than on Medicaid or the entire national defense budget, programs Americans viscerally feel and politically fight over. Yet the interest line item draws comparatively little outrage.
Randomness/Variance Reduction/Importance Sampling