The correct combination of alternatives is:
**a, c, and d**
Here’s why:
- **a)** Describes the primary cause of contemporary climate change, emphasizing the role of greenhouse gases.
- **c)** Addresses the long-term nature of shifts in temperatures and weather patterns, which is central to understanding climate change.
- **d)** Refers to the long-term change in average weather patterns, encapsulating the essence of climate change


