但问题在于，这些管线大多还在早期阶段，短期内很难兑现业绩。
1949年，杜耀豪的外祖母曾想将年轻的林木通接到越南生活，但时局突变，计划永远搁置。林木通终身留在澄海，贫苦务农。2009年临终前，他嘱咐妻子保管好自己的退伍证，如果他的外甥来找他，就拿这个证，和他们认亲。
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"Launching radioactive material through the Earth's atmosphere brings safety concerns. You have to have a special license to do that, but it is not insurmountable," says Dr Simeon Barber, planetary science specialist at the Open University.
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But e-bikes containing lithium-ion batteries are a newer challenge. "When a battery fails, it doesn't necessarily ignite, it will often produce some off-gases," says Stephen Welch, senior lecturer at the University of Edinburgh's Fire Research Centre. "Those off-gases are toxic and flammable. If they accumulate, you can have an explosion risk."