14 Jun How to Improve Environmental Sustainability: An ESS Guide
To improve environmental sustainability, consider how everyday choices and wider policies affect resource use, pollution and people. In IB ESS, explain the mechanism of change and evaluate its limitations. A list of “green” actions alone does not establish which strategy is most effective.
Reduce unnecessary purchases and extend product life
Before replacing an item, consider whether it is needed and whether the existing product can be maintained or repaired. Reusing suitable products can reduce demand for new materials and manufacturing. Recycling helps recover some materials, but it does not remove every impact of production and consumption.
The EPA’s archived explanation of reduction and reuse describes benefits and examples. When comparing products, consider durability, maintenance, safe use and what happens at the end of their life.
Prevent plastic waste without misleading statistics
Plastic debris can persist and break into smaller fragments. Ocean garbage patches are areas where debris accumulates, not continuous solid islands covering a fixed proportion of the sea. NOAA explains that much of the debris, by count, is microplastic and may not be visible from a boat.
Use suitable reusable items where practical, avoid unnecessary packaging, prevent litter and follow local waste collection instructions. An alternative material also has production and disposal impacts, so do not assume that replacing plastic always lowers the total footprint.
Compare transport choices in context
Where feasible, walking, cycling, shared travel or public transport can reduce reliance on individual car trips. Outcomes depend on distance, occupancy, available infrastructure and the transport option replaced.
Identify what would make a proposal workable. Safe routes, accessibility, journey times and costs matter alongside emissions. A policy that some people cannot realistically use may need additional support or alternatives.
Connect individual actions to wider systems
Households make choices within energy, transport and waste systems shaped by governments and businesses. Evaluate improvements at more than one scale: product design, collection services, infrastructure and regulation can change available options.
Ask whether an intervention reduces a problem overall or shifts it elsewhere. A recycling scheme needs evidence about participation, contamination, processing and the materials actually recovered.
Original practice: evaluate a school waste plan
This is an original exercise, not an official IB question or a graded answer. A school proposes reusable lunch containers and separate waste bins. Identify an expected benefit and one possible limitation. What baseline and follow-up measurements would help evaluate the plan?
Consider waste mass and type, participation, washing requirements, costs and access for students. Reach a judgment supported by evidence rather than assuming the plan works because it is labelled sustainable.
Continue with sustainable practices and trade-offs, management strategies and baseline studies to build a clearer ESS response.
Practise with individual ESS support
In Marija’s online IB ESS SL and HL lessons, you can work on concepts, data interpretation and clear explanations. Request a free 20-minute trial lesson to discuss your priorities. For IA work, the investigation and submitted writing remain your own.
Course reference: Official IB ESS guide, first assessment 2026 and IB course updates. Reviewed 7 October 2026.
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