Economically optimal climate strategies may be politically less feasible because they need strong collective action. Fortunately, achieving climate goals through more realistic differentiated policies may not be much more expensive.

中文翻译：

---

不统一气候政策的成本

经济上最优的气候战略在政治上可能不太可行，因为它们需要强有力的集体行动。幸运的是，通过更现实的差异化政策实现气候目标的成本可能不会高得多。