Entrepreneurism is vital as entrepreneurs push technological change and innovation, consequently generating economic growth. Bio-energy entrepreneurism is the focal point of this chapter, along with entrepreneurial motivations, opportunities, and market drivers. Market drivers include government policies, trends in energy use, and progression of the energy sector into more renewables. Several factors influence entrepreneurs, which involves several factors ranging from the environment to economics, pioneering spirit, and social factors. With the help of entrepreneurial motivations and market drivers, individuals can easily visualize and plan all the bio-energy sector opportunities. Bio-energy entrepreneurs moderate the market of transformation of biomass to energy. The bio-energy field is filled with stories of failures, successes, and everything in between. There is a marginal difference between a failure story and a success story in the modern bio-energy sector, which narrow down to timing.

Energy is one of the most precious and demanded commodities among various industries and consumers to sustain the current lifestyle. Energy is a crucial element, which unswervingly influences the country's economic development. Numerous methods are adopted to reduce global warming, embracing clean energy from wind, solar, and biomass sources. This chapter speaks about the current situation of energy demand, the innovations in biofuel sources, and the obstacles regarding the commercialization and production of microalgal biofuel.

Across the globe, solid waste is regarded as one of the main contaminants of surface and freshwater. The primary causes of solid waste generation are the world's expanding population, urbanization, and industrialization. This has grown to be a significant issue with regional and global ramifications. Globally, 2.01 BT (billion tons) of municipal solid garbage are produced annually, of which over 33% need to be managed environmentally. To solve this, achieving sustainability requires effective solid waste management, particularly when it comes to recycling waste goods. Only 16% of waste can be recycled in low-income countries, compared to 51% in high-income countries. Environmental and societal issues can only get worse when solid waste management techniques are inadequate. To address these problems, solid waste is converted to energy via thermochemical and biochemical processes. An in-depth examination of energy recovery and solid waste management in developing nations is given in this chapter.

Plant fragrance is the blend of volatile terpenoids, phenylpropanoids/benzenoids, fatty acid derivatives, and nitrogen- or sulfur-containing compounds released from flowers, leaves, and fruit. It drives pollination and defence and accounts for much of the economic value of aromatic, medicinal, and ornamental crops. However, it shifts with genotype, developmental stage, tissue type, and stress, and a large share of it still comes from wild-harvested plants. Endophytic bacteria are the microorganisms that colonize internal plant tissues without causing apparent disease symptoms, may modulate these specialized metabolic pathways. Only a limited number of studies have directly investigated these interactions. In contrast, a substantially larger body of research has demonstrated the roles of endophytic bacteria in promoting plant growth and enhancing plant tolerance to environmental stresses. However, direct evidence establishing links between bacterial endophytes, specific genes within volatile-biosynthetic pathways, and the volatile compounds actually released by plants remains limited. The current review summarizes the current evidence on the regulation of major plant volatile biosynthetic routes by endophytic bacteria, including the MVA and MEP pathways for terpenoids, the shikimate-derived phenylpropanoid/benzenoid pathway, as well as the lipoxygenase pathway leading to green-leaf volatile production. The suggested mechanisms are generally grouped into several inter-related categories, such as microbial elicitation and pattern recognition, phytohormonal reprogramming, nutrient and precursor acquisition, modulation of carbon flux through the MVA/MEP and phenylpropanoid pathways, redox regulation and stress priming, and bacterial volatile-mediated signalling. More speculative mechanisms are discussed separately, such as microbial biotransformation, direct microbial biosynthesis of plant volatiles, and horizontal gene transfer. Evidence from culinary and essential oil herbs, medicinal plants, ornamental flowers, and fruit crops is evaluated using an evidence hierarchy that distinguishes phenotypic associations from experimentally validated causal mechanisms. Establishing a robust gene-to-metabolite causal framework will require targeted approaches, including gnotobiotic inoculation, volatilomic profiling, and stable-isotope tracing.