At some point in the future , cars could run on electricity or carbon - free hydrogen extracted from coal at facilities where co2 is captured 有朝一日，车辆就能以电力或由煤萃取无碳氢气为动力，而这些动力制造厂都具备捕集二氧化碳的能力。
2.
They are sulphide and free hydrogen sulphide . from 1989 , selected monitoring stations also monitored e . coli and faecal coliforms , which indicate faecal contamination from domestic sewage and animal waste . these two bacterial parameters were extended to all stations from 1999 自1989年开始，部分河溪监测站开始监测大肠杆菌及粪大肠菌群以显示住宅污水及动物粪便所造成的水污染其后在1999年起，所有监测站均测试此两项细菌参数。
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