Draw a water-system boundary
Draw the reservoir boundary and conserve water without treating unmet demand as an outflow.
Environmental science and sustainability
Compare interventions, account for resources and explain who benefits when a decision changes a shared system.
This is the course outline. Open a unit to choose a lesson; every lesson opens on its own page. Explanations and experiments live inside those lesson pages.
Course scope and preparation
Explore 27 lessons on water allocation, biodiversity evidence, nitrogen, land uses, pollution, energy and urban decisions. A fictional seven-day reservoir makes requests, shortages and policy priorities visible. A separate archived USGS river record supports practice with observations, units and evidence limits. Every lesson is directly accessible; no programming is required.
The new land and nutrient investigations trace elemental nitrogen and compare habitat geometry with conditional food and irrigation requirements. Pollution lessons now compare pathways, mass export and transformation with actual water-quality evidence. Energy lessons compare matched electrical demand, storage limits, efficiency and lifecycle boundaries. Urban lessons now compare transport occupancy, empty travel, heat/water/material pathways, conservation and resilience. The school-water intervention project and twelve cumulative assessment cases are available below. They preserve submitted evidence and recorded human review separately from lesson completion. Completing notebooks or matching public practice keys does not establish independent mastery, AP readiness or practical field proficiency.
Preparation and shared foundations
Use basic percentages, algebra and graph reading. Review watershed water accounting, habitat sampling, or scientific inquiry whenever helpful. These shared investigations retain their original notebooks.
Water allocation and observed variability
Compare reservoir allocation policies
Account for both service and storage changes when a downstream request increases.
Stress-test water supply and timing
Explain why finite storage and event order can prevent targets being fulfilled.
Read actual daily streamflow evidence
Convert a reported daily mean into bin volume without inferring peaks or available withdrawals.
Defend a water decision with trade-offs
Distinguish physical consequences from priorities and specify monitoring that could change a decision.
Land, living systems and nutrient accounting
Measure the biodiversity claim
Identify what a count table supports and which biodiversity claims require other evidence.
Distinguish habitat amount from arrangement
Count side-connected components and boundary types without inferring a universal biodiversity ranking.
Follow nitrogen across a plot boundary
Close a nitrogen budget while distinguishing internal transformations from external transfers.
Connect soil functions with food and water
Identify confounds in a soil-cover study and interpret irrigation requirements without inventing yield.
Compare competing uses of a fixed area
Reject an achieved-food claim when conditional requirements exceed the water budget.
Test demand and explain resource limits
Recalculate demand without treating a fixed model carrying capacity as a human limit.
Pollutant pathways, fate and evidence
Trace pollution from source to receptor
Draw a source-pathway-receptor hypothesis and specify observations that could challenge it.
Close a pollutant pulse account
Calculate ordered fractional operations and preserve the parent-equivalent balance.
Separate accumulation from biological effects
Distinguish a water-store increase, bioaccumulation and biomagnification.
Audit actual conductance observations
Calculate valid endpoint differences without converting conductance into pollutant load.
Compare interventions beyond the local store
Write a bounded recommendation with matched inputs, alternative explanations and a revision condition.
Energy service, storage and lifecycle
Trace resources into useful service
Distinguish primary resources, electricity carriers, storage and delivered service.
Match power, energy and service timing
Convert power times duration and keep request and physical energy accounts separate.
Trace storage limits and dispatch losses
Explain an unmet request even when energy remains stored.
Separate efficiency from service demand
Explain why lower input per unit does not guarantee lower total use.
Compare lifecycle burdens at matched service
Calculate a ranking reversal and identify unmeasured environmental indicators.
Stress-test an energy recommendation
Defend a bounded decision using a matched comparison and changed-condition ledger.
Urban systems, transport and resilient decisions
Define transport service before comparing vehicles
Calculate passenger-km and seat utilization without hiding unmet requests.
Compare occupancy and empty travel
Keep empty distance in the operating account and distinguish occupancy denominators.
Trace urban heat, water and materials
Identify confounded temperature comparisons and conserve material without assuming equal service.
Make conservation priorities and access visible
State whose objective is prioritized without building social preferences into a scientific score.
Test resilience and explain adaptation
Distinguish mitigation, adaptation and limited evidence of resilience.
Projects, practice and evidence
Save a prediction, compare controlled scenarios, record the evidence and explain a tradeoff. Numerical agreement and saved prose do not independently assess the quality of a recommendation. Keep physical evidence distinct from stakeholder priorities.
Save a science backup or import one
Science work is stored locally in this browser, separately from mathematics and AI. It does not sync automatically. Use this science-only backup; this checkout's older all-subject export does not include science.
A legacy file is available only when the complete snapshot fits the 36 MB limit. For larger snapshots, prepare a complete file set below; never discard notebooks to make a smaller file.
Matching imported notebook drafts replace their current drafts. Omitted lessons and known first attempts remain. Export your current work first if you want to retain both drafts.
Complete file sets and course backups
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