Fossil pollen studies indicate the Los Angeles Basin was covered with pine and oak forest during the last ice age. It'd be a damn sight better than the concrete and asphalt that covers the place now
The Amazon basin was supposedly drier and more seasonal with the true lowland rainforest restricted to isolated refugia.
The Middle East and the Sahara were supposedly wetter so we might see the desert give way to grassland or savanna.
Of course, not all glaciations were of equal severity. Sometimes the 2km thick ice sheets came far south, other times they supposedly stayed a little further north. Mining those tar sands in Alberta would be a Beeeeyotch if the glaciers showed up to stay one winter








But I'll try to believe you.