Search results

The increasing accumulation of synthetic plastic waste in oceans and landfills, along with the depletion of non-renewable fossil-based resources, has sparked environmental concerns and prompted the search for environmentally friendly alternatives. Biodegradable plastics derived from lignocellulosic materials are emerging as substitutes for synthetic plastics, offering significant potential to reduce landfill stress and minimise environmental impacts. This study highlights a sustainable and cost-effective solution by utilising agricultural residues and invasive plant materials as carbon substrates for the production of biopolymers, particularly polyhydroxybutyrate (PHB), through microbiological processes. Locally sourced residual materials were preferred to reduce transportation costs and ensure accessibility. The selection of suitable residue streams was based on various criteria, including strength properties, cellulose content, low ash and lignin content, affordability, non-toxicity, biocompatibility, shelf-life, mechanical and physical properties, short maturation period, antibacterial properties and compatibility with global food security. Life cycle assessments confirm that PHB dramatically lowers CO₂ emissions compared to traditional plastics, while the growing use of lignocellulosic biomass in biopolymeric applications offers renewable and readily available resources. Governments worldwide are increasingly inclined to develop comprehensive bioeconomy policies and specialised bioplastics initiatives, driven by customer acceptability and the rising demand for environmentally friendly solutions. The implications of climate change, price volatility in fossil materials, and the imperative to reduce dependence on fossil resources further contribute to the desirability of biopolymers. The study involves fermentation, turbidity measurements, extraction and purification of PHB, and the manufacturing and testing of composite biopolymers using various physical, mechanical and chemical tests.

Over the past decade, biofuels production in the European Union and the United States has boomed – much of this due to government mandates and subsidies. The United States has now surpassed Brazil as the world's leading producer of ethanol. The economic and environmental impact of these biofuel programs has become an important question of public policy. Due to the complex intersectoral linkages between biofuels and crops, livestock as well as energy activities, CGE modeling has become an important tool for their analysis. This chapter reviews recent developments in this area of economic analysis and suggests directions for future research.

Purpose – To identify how agricultural biotechnology addresses the two challenges facing agriculture: to feed a world growing to 9 billion people by 2050 and to provide a liquid fuel alternative to petroleum.

Design –This chapter relies on econometric modeling, a review of existing literature, and diagrammatic modeling to articulate the impact of agricultural biotechnology on food and energy markets.

Findings –Agricultural biotechnology reduces the tension between food security and biofuel production. It reduces volatility in food and fuel markets and can mitigate risk to biofuel processors.

Originality – The analysis is original although it relies on previous research to some extent. The analysis is compared to and contrasted with related work.

Composites based on fiber are commonly used in high-performance building materials. The composites mostly use petrochemically derived fibers like polyester and e-glass, due to their advantageous material features like high stiffness and strength. All the same, these fibers also have important shortcomings related to energy consumption, recyclability, initial processing expense, resulting health hazards, and sustainability. Increasing environmental awareness and new sustainable building technologies are driving the research, development, and usage of “green” building materials, especially the development of biomaterials.

In this chapter, the natural fiber evaluation approach is applied, which covers a diverse set of criteria. Consequently, the comparative assessment of diverse natural fiber types is applied through the use of an expert decision system approach. The best performing fiber choice is made by comparatively evaluating the materials related to green building. The proposed fiber can be used and applied by green building material manufacturing companies in various countries or locations as a reference when selecting the fiber with the best performance.

In the United States, successive farm bills and the 2007 Renewable Fuels Standard (RFS) have largely defined domestic subsidy and conservation programs and U.S. food-aid initiatives over the past decade. This chapter examines the effects of the current mixture of U.S. agricultural policies and international food-aid programs on domestic and global food-insecure populations. A detailed research-based examination is carried out with respect to the impacts of U.S. subsidy programs on agricultural production, domestic and global agricultural commodity prices, and their implications for food-insecure populations. The impacts of the RFS are assessed along with the effects of current and potentially reformed U.S. international food-aid programs.

This study concludes that current U.S. agricultural subsidy programs have small or negligible impacts on the aggregate level and mixture of U.S. agricultural output, U.S. domestic prices and global prices, and domestic and global food insecurity among poor households. The RFS has increased prices for food and feed grain and oilseeds with adverse implications for the urban poor in developing countries and some poor U.S. households. The portfolios of U.S. food-aid programs are managed inefficiently because of congressional mandates designed to aid special interest groups that waste 30% of the current budget. While U.S. subsidy programs likely should be moderated for other reasons, they have few impacts on domestic and globally food-insecure households. However, in relation to global and domestic food insecurity, the RFS should be discontinued and major reforms to U.S. international food aid implemented.

Many jurisdictions fine illegal cartels using penalty guidelines that presume an arbitrary 10% overcharge. This article surveys more than 700 published economic studies and judicial decisions that contain 2,041 quantitative estimates of overcharges of hard-core cartels. The primary findings are: (1) the median average long-run overcharge for all types of cartels over all time periods is 23.0%; (2) the mean average is at least 49%; (3) overcharges reached their zenith in 1891–1945 and have trended downward ever since; (4) 6% of the cartel episodes are zero; (5) median overcharges of international-membership cartels are 38% higher than those of domestic cartels; (6) convicted cartels are on average 19% more effective at raising prices as unpunished cartels; (7) bid-rigging conduct displays 25% lower markups than price-fixing cartels; (8) contemporary cartels targeted by class actions have higher overcharges; and (9) when cartels operate at peak effectiveness, price changes are 60–80% higher than the whole episode. Historical penalty guidelines aimed at optimally deterring cartels are likely to be too low.