# rule of 70 - dP/dt = (B-D) = bP - dP = (b-d)P = gP, ln2/g = .7/g (70/g in percentage) - investment of x percent per year divide 70 with the fractional growth rate (rule of 70) - 반감기 = ln2/k (reaction coefficient which is temperature dependent) - # climate change ## stock and flow ![[Pasted image 20220926152139.png]] - greenhouse gas (h20 gas, CO2) - heat (sunlight inflow and outgoing ) - more water evaporation, more green house gas - average temperature about the earth, heat or energy (capture temperature); sunlight inflow and radiation outflow increase temperature; tundra biomass; emission warmer temperature, under frozen increase green house gases - as temperature goes up, more air conditiong, increases energy production ## ☁️ cloud challenge - capacity of sinks changes (gas is observed in ocean but not forever) - aggressive automaker leasing created new competitors (we created superstores) - should collect data for how ppl buy new cars - policy recommendations were developing new clinics to assess consumer tradeoffs of new vs off-lease/used vehicles - move to longer terms (> 3yr) - reduce subvention