An alternative GWP index was proposed by Danny Harvey. which explicitly takes into account the duration of capital invest- ments in the energy sector and is less sensitive to uncertainties in atmospheric lifespans and radiative heating than usual GWP index for-time horizons longer than the lifespan of capital invest- ment and the effect of this alternate GWP index proposed here is that, compared with previous indices, is to shift attention away from short lived gases such as methane and toward CO2