There is a continuous and growing interest in new alternatives for biomass and bioenergy crops (as well as biofuels).
This post shows some findings regarding the interest and research (number of publications) in www.sciencedirect.com
As you can see interest in biomass and bioenergy increased dramatically in particular in past 5 years. Energy crops (which includes use of crops for biomass production plus dedicated biomass plantations and multi purpose models) are also a growing trend. Biochar seems to be an emerging topic with early beginnings in the 90s but a considerable increment in past 5 years.

Some other charts with interest that are interesting trends are shown below:

In 2018, global biofuel production levels reached 95.4 million metric tons of oil equivalent, in stark comparison to the 9.2 million metric tons of oil equivalent that was produced in 2000. Growth has largely been driven by policies that encourage the use and production of biofuels due to the perception that it could provide energy security and reduce greenhouse gas emissions in relevant sectors. Biofuels can be beneficial due to its limited environmental impacts in comparison to fossil fuels as well as its consumption of waste materials that would normally be discarded. Blending mandates, sustainability criteria, fuel quality standards, and import tariffs have impacted the biofuel market. The global biofuels market is expected to reach a market size of 132.7 billion U.S. dollars by 2023.


Wood pellet production worldwide from 2000 to 2018(in million metric tons)

Source: https://commons.wikimedia.org/wiki/File:US_Electricity_from_renewables.png
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