This alteration of atmospheric chemistry changes climate cycles both globally and locally.

But the climate cycles are too strong to be explained as the direct effect of the astronomical changes alone.

This is the tilt which is the main cause of the annual climate cycle of spring, summer, autumn, winter.

Nevertheless, attempts to connect the solar cycle with climate cycles were popular in the 1920s and 1930s.

The strata show ancient climate cycles, like tree rings.

But they still do a lot of excavating, to reconstruct the ancient climate cycles.

Since the climate cycle went haywire, not one of the forecasts was worth a thing.

On geologic time scales, climate cycles can result in cyclic vegetation changes by directly altering the physical environment.

At this rate, even climate cycles are visible only as a softening of picture definition.

Recent, minor climate changes are entirely consistent with well-established, long-term natural climate cycles.