在餐厅不要请求电子邮件收据。
不仅你需要为小费和餐厅额外收取的“员工成本”费用支付额外的费用（在美国这确实存在），当你在他们的支付系统中输入电子邮件地址时，你实际上是在给他们更多的钱。我注意到这种趋势，当我开始收到来自我很久以前去过的地方的广告时。因此，减少印刷纸张以保护环境的想法实际上意味着公司获得更多的利润。
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Not only you are paying extra for tips and whatever the restaurant adds additional chargers to cover “employee costs” (yes this is real in the US), you are giving them more money when you put your email address in their payment system. I noticed such a trend when I started receiving advertisements from places I had visited long time ago. So this idea of saving the environment by cutting down on printed paper means more money to companies.