Briefly explain the provision of section 115 BBG of The Income Tax Act, 1961, regarding taxability of income earned from transfer of "Carbon Credits" for assessment year 2019-20.

Tax on Income from transfer of Carbon Credits [Section 115BBG]: Where the total income of an assessee includes any income by way of transfer of carbon credits, the income-tax payable shall be the aggregate of: (a) the amount of income-tax calculated on the income by way of transfer of carbon credits, at the rate of 10%; and (b) the amount of income-tax with which the assessee would have been chargeable had his total income been reduced by the amount of income referred to in clause (a). Notwithstanding anything contained in this Act, no deduction in respect of any expenditure or allowance shall be allowed to the assessee under any provision of this Act in computing his income referred to in clause (a) of sub-section (1). Explanation : "carbon credit" in respect of one unit shall mean reduction of one tonne of carbon dioxide emissions or emissions of its equivalent gases which is validated by the United Nations Framework on Climate Change and which can be traded in market at its prevailing market price.