Spring and autumn are shrinking.

1, (1) Global temperature change (2) Environmental and ecological destruction.

2.( 1) High temperature in early spring or winter will be beneficial to the survival of overwintering pests. (2) It may destroy the food chain.

Birds can no longer remind the arrival of a season as before.

4. Use column numbers and comparison methods. The function of column number is to make the explanation specific and accurate and convince the readers. The function of comparison is to make readers get a concrete and vivid impression through comparison.

There is no "some" in the second paragraph. Has it been removed?