SECTION V.. What Means Have We of Judging of the Climate of Former Periods?

What means have we of judging of the climate of former periods?

What was the climate of the coal period?

What animal fossils indicate a former warm climate?

What evidence that Siberia once enjoyed a milder climate?

Do similar indications appear in the southern hemisphere?

When has the climate of the earth been most uniform?

Has the climate been growing gradually colder to the present time?

What is the evidence of a somewhat recent period of intense cold?

What recent local changes of climate are mentioned as having occurred?