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  • The round-up on last year's global investment in clean energy shows that renewables continued their rapid ascendancy, bringing multiple benefits for all.

  • Energy storage will play a key role in increasing the use of variable energy sources. Nonetheless, storage is not the only balancing option and the overall design of power systems will incorporate a range of flexible generation, storage and grid-balancing options of different types and scales.

    • David Elliott
  • Energy systems around the globe are changing in response to new technological developments and environmental and social pressures. Making the most of these changes requires a concerted effort from academia, industry and government — an effort Nature Energy intends to support.

  • The past five years have seen substantial cost reductions and greatly increased uptake of photovoltaics. Growth is being driven by ongoing improvements in both silicon solar cell costs and performance, making the commercialization of new technologies increasingly difficult.

    • Martin A. Green
  • Climate change mitigation requires gigatonne-scale CO2 removal technologies, yet few examples exist beyond niche markets. The flexibility of thermochemical conversion of biomass and fossil energy, coupled with carbon capture and storage, offers a route to commercializing carbon-negative energy.

    • Daniel L. Sanchez
    • Daniel M. Kammen
  • Meeting the world's energy needs requires the collective efforts of many different actors across a range of technologies and approaches. In this Feature, ten leading experts in energy research share their vision of the challenges their respective fields must address in the coming decades.

    • Robert C. Armstrong
    • Catherine Wolfram
    • M. V. Ramana