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Gross emissions (decrease through reductions)Sequestration and removal (afforestation, CCS, and credits)Net emissions = gross − sequestration
Emissions Chart
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Gross emissions (t-CO₂/year)
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Absorption and removal (t-CO₂/year)
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Net emissions (t-CO₂/year)
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Until net zero
Sweeps the timeline from 2025 to 2050, showing declining gross emissions intersecting with accumulated removals as net emissions reach zero (carbon neutrality).
FAQ
What is carbon neutrality?
Carbon neutrality means balancing CO2 emitted with CO2 removed or offset, achieving net zero emissions. Japan targets carbon neutrality by 2050.
What is the average Japanese per-capita CO2 emission?
About 8.4 t-CO2 per year (2020). This is mid-range among developed nations.
Can tree planting offset my emissions?
One tree absorbs about 10 kg CO2 per year. Planting alone is impractical for large emitters — reducing emissions first is essential.
What are the most impactful reductions?
Switching to renewable electricity, electric vehicles, reducing flights, and cutting beef consumption have the largest individual impact.
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I can see the simulation updating, but what exactly is being calculated here?
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Great question! The simulator solves the governing equations in real time as you move the sliders. Each parameter you control directly affects the physical outcome you see in the graph. The key is to build an intuitive feel for how each variable influences the result — that's how engineers develop physical judgment.
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So when I increase this parameter, the curve shifts significantly. Is that a linear relationship?
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It depends on the model. Some relationships are linear, but many engineering phenomena are nonlinear. Try moving the sliders to extreme values and see if the output changes proportionally — if the graph shape changes, that's a sign of nonlinearity. This hands-on exploration is exactly what simulations are best for.
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Where is this kind of analysis actually used in practice?
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Constantly! Engineers run these calculations during the design phase to quickly screen parameters before investing in expensive physical tests or detailed finite element simulations. Getting comfortable with these simplified models is a real engineering skill.
Enter annual electricity consumption (kWh) in numE-cn field. Select grid source (sE dropdown: Natural Gas 0.45 kg CO2/kWh, Coal 0.95 kg CO2/kWh, Renewable 0.02 kg CO2/kWh). Input quantity in sENum.
Enter transport distance (km/year) in numC-cn field. Choose vehicle type (sC dropdown: Petrol 0.21 kg CO2/km, Diesel 0.18 kg CO2/km, EV 0.05 kg CO2/km). Specify vehicle count in sCNum.
Enter lifestyle emissions (numF-cn): heating fuel consumption (MWh), waste generation (kg/year), food sourcing (% local). System calculates total Scope 1, 2, 3 emissions and displays carbon footprint in tonnes CO2-eq.
Worked Example
Manufacturing facility: 150,000 kWh annual consumption from natural gas grid (0.45 kg CO2/kWh = 67.5 tCO2), fleet of 8 diesel vehicles traveling 45,000 km total (0.18 kg CO2/km = 8.1 tCO2), heating via 25 MWh natural gas (0.29 kg CO2/kWh = 7.25 tCO2). Total baseline = 82.85 tCO2/year. Target 50% reduction by 2030: switch to 60% renewable electricity (reduce to 27 tCO2), convert 5 vehicles to EV (reduce to 3.6 tCO2 transport), upgrade insulation (reduce heating to 3.6 tCO2). New total = 34.26 tCO2 (58.6% reduction achieved).
Practical Notes
Grid carbon intensity varies by region: UK 0.19 kg CO2/kWh vs Poland 0.74 kg CO2/kWh. Update sE dropdown to match local transmission operator data for accuracy.
Scope 3 (supply chain) emissions typically represent 70-90% of corporate carbon footprint. Include raw material sourcing, product transport, and end-of-life disposal when setting reduction targets.
EV carbon payback period averages 18-24 months when replacing petrol vehicles in high-mileage fleets, accounting for manufacturing emissions (60-65 kg CO2 per kWh battery capacity).
Carbon offsets (reforestation, renewable energy credits) cost EUR 15-50/tCO2 but should complement rather than replace emission reductions for credible net-zero claims.