How losing biodiversity could be killing us

The video opens by illustrating how a small cut could have been fatal before penicillin, an antibiotic derived from nature. Many other essential drugs for malaria, pain, and cancer also originate from natural substances. The discovery of penicillin by Alexander Fleming in 1928, from mold on uncleaned petri dishes, showcased nature's medicinal potential. Ethnobotanist Cassandra Quave emphasizes the ongoing reliance on natural molecules for new medicines, with approximately 70% of cancer medications based on natural substances. Historically, diverse cultures have used plants like fig tree latex for parasites and neem oil for skin disorders, with an estimated four billion people still relying on natural medicines today.

Access to natural remedies is increasingly difficult due to rapid biodiversity loss. The International Union for Conservation of Nature's Red List indicates over a quarter of 150,000 assessed species are threatened with extinction, with animals disappearing at an unprecedented rate. Experts like EJ Milner-Gulland, Professor of Biodiversity at Oxford University, attribute this crisis, potentially worse than climate change, primarily to human activities such as overharvesting and land conversion for agriculture and livestock. Other contributing factors include climate change, invasive species, and pollution, all disrupting the delicate balance of ecosystems.

The video uses a Jenga tower analogy to explain ecosystem instability: the loss of species, one by one, gradually weakens the system until it collapses, leading to mass extinctions. Healthy ecosystems are vital for human health beyond just medicine. Trees and shrubs purify air, preventing millions of deaths annually from air pollution, as seen in a Boston University study. Soil microbes are crucial for 95% of global food production, and wetlands, exemplified by Kolkata, naturally purify wastewater. Peninah Murage from the London School of Hygiene and Tropical Medicine notes that these free ecosystem services are undervalued, despite being worth an estimated 140 trillion euros annually.

While natural resources have historically improved human health and increased life expectancy, excessive exploitation now threatens this progress. By destroying biodiversity, humanity becomes more vulnerable to health crises, such as zoonotic diseases like COVID-19, Ebola, and HIV, which jump from animals to humans. Activities like deforestation and hunting increase human-wildlife contact, raising the risk of outbreaks. The video warns that continued environmental degradation will lead to a decline in human health and well-being.

To mitigate this crisis, various solutions are proposed. Rewilding, or rebuilding ecosystems by reintroducing lost species, and agroforestry, which integrates native trees and shrubs into agriculture to improve soil fertility, are highlighted. Protecting existing forests and planting more trees are also crucial, as forests house 80% of terrestrial biodiversity, purify air and water, and absorb CO2. Global commitments aim to protect 30% of land and oceans and restore degraded areas by 2030, but action is essential. The video concludes by emphasizing the intricate link between human and planetary health, suggesting that nurturing nature can lead to discoveries of new medicines, such as from sea sponges or plant species to combat antibiotic-resistant bacteria, in an urgent race against time.