Seljak, Uros2015-01-292015-01-292015https://hdl.handle.net/11299/169645I will review the lensing effects in CMB polarization, both as a science driver and as a nuisance. I will discuss reconstruction methods and delensing methods to remove it from CMB polarization, and the ultimate reach of these methods in terms of gravity wave B modes.enFTPICMBPresentation