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Determinants of the Pace of Global Innovation in Energy Technologies

Figure 1

Temporal trends in energy patents.

(A.) Time series for US energy patents published during the period 1974-2009 show rapid growth over the last decade (upper panel), with the greatest increases in renewables patents. Public funding (lower panel) for energy R&D (1974-2008) increased dramatically in the 70s and 80s but then remained relatively constant. (B.) A similar trend in patenting (1974-2008) is seen when aggregating globally (upper panel). Funding for public R&D (1974-2008) among IEA countries (lower panel) shows only modest increases in recent years.

Figure 1

doi: https://doi.org/10.1371/journal.pone.0067864.g001