At z = 1 − 3, the formation of new stars is dominated by massive, dusty galaxies, whose far-IR emission indicates they contain colder dust than their counterparts in the local Universe. I explore the reasons for the evolving IR emission of similar galaxies over cosmic time using three samples of dusty galaxies. Despite similar infrared luminosities, z > 0.5 dusty star forming galaxies have an order of magnitude higher dust masses and 5 K colder dust temperatures. The increase in dust mass is linked with an increase in the gas fractions of dusty star forming galaxies with redshift. I find that dusty star forming galaxies are predominantly located on the main sequence at z=1-2, and I explore whether an active galactic nucleus is linked with declining star formation in these galaxies. Finally, I make predictions for the demographics of dusty galaxies that we will be able to observe with the James Webb Space Telescope at z=1-2.
