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Would have ever thought Rudolf Diesel and Henry Ford that a day will come when fuel will be extracted from algae? What would Diesel say when hearing about biodiesel or green diesel? Or would Ford say "I told you so" when discovering that ethanol became a reliable fuel? We would be proud to tell them how many efforts have been made and how many scientists and researchers dedicated their work to biofuels. The present paper makes an introduction into the biofuels' field and tries to answer the question raised in the title by providing a genuine configuration of biofuels generations and supporting evidence of their trends which will help both Ford and Diesel catch up with progress. By their nature, biofuels remain a large debated subject, a useful tool for tackling energy questions and a growing alternative to be explored in more depth.

The purpose of this study is to analyze the evolution of the scientific research regarding the relationship between energy and economic growth, in order to reveal preferred topics and less approached themes. We conducted an occurrence and cluster analysis, followed by a correspondence analysis using articles published between 1979 and 2019 in journals indexed in the Web of Science. The analysis was split into three periods taking into account the major economic and energetic milestones. The analysis focused on distribution of the topics studied both by years and by journals. The research revealed some major trends: there has been an explosive increase in studies based on Asian countries over the three periods as concerns for sustainable development intensified, and environmental issues were associated with research on the relationship between energy and economic growth. Even if the journals cover different scientific areas, during the last 10 years they contain articles with very similar topics.

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