（九）经济社会发展全面绿色转型加快，生态文明建设成效显著。一是碳达峰碳中和积极稳妥推进。完善碳排放总量和强度双控制度体系。开展第一批国家级零碳园区建设。可再生能源装机占全国电力总装机60.1%、发电增量首次超过全社会用电增量。新型储能装机规模达到1.36亿千瓦。单位国内生产总值二氧化碳排放降低5.0%，非化石能源消费占能源消费总量比重21.7%。二是污染防治和生态保护修复不断强化。全国地级及以上城市细颗粒物（PM2.5）平均浓度下降4.4%，地表水达到或好于Ⅲ类水体比例为91.4%，土壤污染源头防控行动深入实施。“三北”工程三大标志性战役全面启动。完成国土绿化任务1.27亿亩。三是全面节约战略实施成效明显。深入实施重点领域节能降碳专项行动，单位国内生产总值能耗降低5.1%。万元国内生产总值用水量下降4%左右。强化全链条粮食减损和餐饮行业反浪费。大宗固废综合利用率超60%。
Documents of products collection are intentionally designed to be more complex and larger than accounts - I want to see what happens, what is the performance penalty mainly, once individual documents are stored on multiple database pages. In Postgres, page size is 8 KB by default - in practice, the goal is to have at least 4 rows stored on a single page, so every record that is larger than 2 KB is put on two or more disk pages. It obviously reduces performance for both writes & reads - more disk pages to read from and write to. In Mongo it works slightly differently in details, but essentially in the same vein - larger documents are stored on more than one page, degrading performance for all operations. In both cases we are about to see - how much exactly.
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