Rashi, Leviticus 26:19

I will break the pride of your strength This is the Temple, and so Scripture says, “Behold I profaning My Sanctuary, the pride of your strength” (Ezek. 24:21). - [Torath Kohanim 26:27]and make your skies like iron and your land like copper This is more severe than that of Moses, for there he says, “And your sky above you will be [like] copper and the earth beneath you (like) iron” (Deut. 28:23), that the sky will sweat as copper sweats, and the earth will not sweat, just as iron does not sweat, and therefore, [the earth] will preserve [any of] its [existing] fruit. Here, however, [in this harsher curse, pronounced by God Himself,] the sky will not sweat, just as iron does not sweat, and therefore, there will be drought in the world, while the earth will sweat, just as copper sweats, thus causing its fruits to rot [through its dampness].— [Torath Kohanim 26:28] [translation by Judaica Press]