BJMP Entrance Exam General Information — Environmental Management & EcologyStudy Notes

Water pollution control is essential for maintaining clean water supplies and protecting aquatic ecosystems. The treatment of wastewater follows a systematic three-phase approach to ensure water safety and environmental protection. Primary Treatment involves the initial cleaning of wastewater through sedimentation (allowing particles to settle), coagulation (binding small particles together), and filtration (removing suspended materials). This process removes basic contaminants before water discharge. Secondary or Biological Treatment includes softening (removing minerals that cause hardness) and aeration (adding oxygen to support beneficial bacteria that break down organic pollutants). This biological process significantly improves water quality. Tertiary Treatment represents the final stage where water undergoes disinfection, typically using chlorine to eliminate remaining bacteria and pathogens, making water safe for various uses. Water conservation practices are equally important and include residential conservation (using water-efficient appliances, fixing leaks promptly, and practicing mindful water use), xeriscaping (drought-resistant landscaping that minimizes irrigation needs while maintaining aesthetic appeal), and agricultural conservation (implementing efficient irrigation systems and crop rotation to reduce water waste).

Land use refers to how humans utilize land resources for various economic and cultural activities. Globally, land is classified into different categories: agricultural land (37.6% of total land area) which includes arable cropland (28%), permanent crops (3%), and pastureland (69%). The remaining land consists of glaciers (10%), barren land including deserts (19%), forests (37% of habitable land), shrubs and grasslands (11%), freshwater coverage (1%), and built-up urban areas (1%). In the Philippines, agricultural land comprises 41% of total area, with arable land at 18.2%, permanent crops at 17.8%, permanent pasture at 5%, forests at 9%, and other uses at 1%. Land degradation occurs due to multiple factors including deforestation (removal of forest cover leading to soil erosion), overgrazing (excessive livestock feeding that depletes vegetation), poor agricultural practices (improper farming techniques that exhaust soil nutrients), industrialization (pollution and contamination of land resources), and rapid urbanization (conversion of agricultural land to residential and commercial use). The effects of land degradation are severe: loss of soil fertility due to nutrient depletion, reduced vegetation cover leading to increased erosion, changes in soil characteristics affecting productivity, water pollution from contaminated runoff, and climate changes resulting from environmental imbalances.

Biodiversity encompasses the variety of life on Earth at three distinct levels. Genetic Diversity refers to the genetic variations within species, explaining why individuals of the same species have unique characteristics and why multiple varieties of crops like rice, wheat, and corn exist. Species Diversity represents the variety of different species found in particular areas, with tropical regions having the highest diversity and polar regions having the lowest. Tropical rainforests, coral reefs, and ocean bottom zones are the most species-rich environments. Ecological Diversity describes the variety of ecosystems where plants and animals coexist through complex food webs and food chains, creating interconnected communities. The importance of biodiversity cannot be overstated: it ensures health and food security by providing nutritional variety and supporting agricultural systems, helps fight disease through natural compounds found in diverse species, benefits business as over half of global GDP depends on nature, provides livelihoods for millions of people worldwide, and protects us by maintaining ecological balance that makes Earth habitable. However, biodiversity faces serious threats including climate change (altering habitats and species distribution), habitat loss and degradation (primarily through human activities like agriculture and industrial expansion), pollution (especially nitrogen and phosphorus loading that disrupts ecosystems), invasive species (non-native organisms that outcompete local species), and overexploitation (harvesting species faster than they can reproduce).

Global warming refers to the long-term increase in Earth's average temperatures due to greenhouse gas concentrations, while climate change encompasses broader environmental modifications including precipitation, temperature, and wind pattern changes over extended periods. Greenhouse gases trap heat in the atmosphere by allowing sunlight to enter but preventing heat from escaping. The main greenhouse gases include water vapor, carbon dioxide, methane, nitrous oxide, and chlorofluorocarbons. Major causes of global warming include fossil fuel combustion (burning coal, oil, and gas produces carbon dioxide and nitrous oxide), deforestation (reducing Earth's capacity to absorb carbon dioxide), intensive farming (livestock and fertilizers release methane and nitrous oxide), waste disposal (landfills and incinerators emit methane and toxic gases), mining operations (releasing stored carbon and methane), and overconsumption (increasing demand for energy and resources). Prevention strategies focus on renewable energy adoption (solar, wind, biomass, and geothermal energy to replace fossil fuels), energy and water efficiency (using LED bulbs and efficient devices to reduce consumption), sustainable transportation (promoting public transport, carpooling, and electric vehicles), sustainable infrastructure (building energy-efficient structures and retrofitting existing buildings), sustainable agriculture and forest management (implementing eco-friendly farming practices and preventing deforestation), and responsible consumption and recycling (adopting conscious consumption habits and comprehensive recycling programs).

Environmental hazards are classified according to their causal agents and impact patterns. Natural hazards include infrequent events like earthquakes and hurricanes, and relatively common events like blizzards and coastal erosion. The Philippines faces over 20 typhoons annually, with five typically being devastating, plus earthquakes, volcanic eruptions, tsunamis, sea-level rise, storm surges, landslides, floods, and droughts. Physical hazards involve non-biological environmental threats that can cause harm to human health and ecosystems. Social disruptions include terrorism, riots, warfare, overpopulation, poverty, illiteracy, and social unrest that create environmental and health risks. Biological agents or biohazards encompass organisms and their by-products that are toxic or dangerous to humans, including pathogenic bacteria, viruses, parasites, and biological toxins. The COVID-19 pandemic exemplifies how biological hazards can cause global disruption. Chronic and global significant hazards include climate change, pollution, and environmental degradation that persist over long periods and affect large geographic areas. To reduce environmental hazards and carbon footprints, individuals and organizations should use energy more efficiently, install renewable energy systems, conserve water resources, practice the three Rs (reduce, reuse, recycle), and minimize travel when possible.

Environmental protection requires comprehensive legal frameworks and organizational efforts at both national and international levels. Major Philippine environmental laws include RA 9003 (Philippine Ecological Solid Waste Management Act of 2000) which ensures systematic waste management through proper segregation, collection, and disposal; RA 9275 (Philippine Clean Water Act of 2004) protecting water bodies from land-based pollution through integrated strategies; RA 8749 (Philippine Clean Air Act of 1999) maintaining air quality standards and minimizing economic impacts; RA 6969 (Toxic Substances and Hazardous Waste Control Act of 1990) controlling import, manufacture, and disposal of dangerous substances; Presidential Decree 1586 establishing the Environmental Impact Assessment System; RA 9729 (Climate Change Act of 2009) integrating climate change considerations into government policies; and RA 9512 (Environmental Awareness and Education Act of 2008) promoting environmental education across all educational levels. International environmental organizations play crucial roles: Greenpeace focuses on biodiversity preservation and confronting environmental abuses; Environmental Defense Fund uses science and economics to address environmental problems; International Union for Conservation of Nature leads global conservation efforts; and Nature Conservancy protects wildlife and natural habitats. Key international agreements include the Kyoto Protocol (reducing greenhouse gas emissions), Paris Agreement (limiting global warming to below 2°C), Montreal Protocol (protecting ozone layer), and Convention on Biological Diversity (conserving biological diversity and ensuring equitable benefit sharing).

Sustainable development represents a comprehensive approach to meeting present needs without compromising future generations' ability to meet their own needs. This concept balances environmental protection, economic growth, and social equity. The four pillars of sustainability include Human Sustainability (preserving and enhancing society's human capital through investments in health, education, and essential services), Social Sustainability (maintaining social cohesion through investments in community services and interpersonal relationships), Economic Sustainability (maintaining financial capital while improving living standards), and Environmental Sustainability (protecting natural resources like land, air, water, and minerals to ensure long-term human well-being). The United Nations established 17 Sustainable Development Goals (SDGs) in 2015 as a global framework to eradicate poverty, protect the environment, and ensure peace and prosperity by 2030. These interconnected goals recognize that progress in one area affects outcomes in others. The Philippines Strategy for Sustainable Development (PSSD) aims to achieve economic growth while protecting biological resources and environmental quality through ten key strategies: integrating environmental considerations in decision-making, proper pricing of natural resources, property rights reform, establishing protected areas systems, rehabilitating degraded ecosystems, strengthening industrial pollution control, integrating population and social welfare concerns, inducing rural growth, promoting environmental education, and strengthening citizen participation. Sustainable development is significant because Earth's growing population will strain resources within the next 20 years, making resource conservation and sustainable practices essential for meeting future human needs.