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We study how conserved quantities such as angular momentum and center of massevolve with respect to the retarded time at null infinity, which is describedin terms of a Bondi-Sachs coordinate system. These evolution formulaecomplement the classical Bondi mass loss formula for gravitational radiation.They are further expressed in terms of the potentials of the shear and newstensors. The consequences that follow from these formulae are (1)Supertranslation invariance of the fluxes of the CWY conserved quantities. (2)A conservation law of angular momentum \`a la Christodoulou. (3) A dualityparadigm for null infinity. In particular, the supertranslation invariancedistinguishes the CWY angular momentum and center of mass from the classicaldefinitions.

Evolution of angular momentum and center of mass at null infinity