How organic waste could power the circular economy | Gamuchirai Mutezo | TEDxJohannesburg

Quick Overview

Gamuchirai Mutezo advocates for a mindset shift in Africa to treat organic waste as a valuable resource rather than a problem, detailing a circular economy model that converts waste into biogas, compost, biochar, biofuel, and animal feed, thereby creating economic opportunities and reducing landfill use.

Key Points: Across Sub-Saharan Africa (SSA), only about 44% of waste is collected, with 31% openly dumped, 37% landfilled, 19% recycled/composted, and 11% incinerated. The speaker champions a 'Separation at Source' (S@S) approach, urging people to move away from linear waste disposal to circular economy practices. Organic waste, which is a major component of city waste, can be valorized into five key outputs: Biogas, Compost, Biochar, Biofuel, and Animal Feed. Biogas production from anaerobic digestion provides decentralized energy for heating, cooking, and lighting. The circular model creates opportunities for local innovators and entrepreneurs, supporting green jobs and providing soil nutrients (digestates) for agriculture. The presentation highlights the need for intentional investment and engagement from public, private, and CBO sectors to support this transition. The speaker challenges the audience to immediately change their waste habits at home, work, and in decision-making spaces.

Context: Gamuchirai Mutezo delivered this TEDxJohannesburg talk titled 'Not Wasting This Particular Story: Rethinking Africa’s Urban Organic Waste' in October 2025. She addresses the significant challenge of rapidly growing urban waste in African cities, emphasizing that current linear waste management practices are unsustainable and environmentally damaging. Her core argument centers on reframing organic waste as a vital resource within a circular economy framework, which she illustrates through a detailed demonstration site model.

Detailed Analysis

Gamuchirai Mutezo argues that African cities must stop treating waste as a linear problem and instead adopt a circular economy model, particularly for organic waste. She cites statistics showing low collection rates (only 44% across SSA) and high rates of dumping and landfilling. Mutezo presents a five-part valorization system for organic waste: Biogas (for energy), Compost, Biochar, Biofuel, and Animal Feed. She stresses that this process not only addresses environmental issues like climate change but also creates significant socio-economic benefits, such as green jobs and income generation for local innovators and waste reclaimers. The speaker explicitly calls for intentional efforts across public, private, and community sectors to support this transition, urging the audience to start practicing separation at the source in their daily lives. The presentation concludes by showing a diagram of the 'Waste Valorisation Demonstration Site' model, illustrating how waste can be turned into valuable outputs like soil nutrients and energy, thus closing the loop.