Readers responding to a recent essay propose that the absence of evidence for extraterrestrial civilizations may stem from a lack of accessible fossil fuels on other planets, which are necessary for industrial development and space travel.
Fossil fuels may explain why intelligent aliens remain elusive, readers suggest
Readers responding to a recent essay propose that the absence of evidence for extraterrestrial civilizations may stem from a lack of accessible fossil fuels on other planets, which are necessary for industrial development and space travel.
Fossil fuel power station · Wikimedia — licence per file · rights
Monitoring item. The full text is not distributed. Extract and source below.