该报告警告说，已经没有时间了。
该报告警告说，食品价格的飙升有可能会蔓延到其他消费品上。
It warned that the price hikes of food products could spread to other consumer products.
然而，该报告警告说，为环境服务付费并非是适用于各种情况的最佳解决办法，而且在执行方面依然面临巨大挑战。
The report however cautions that payments for environmental services are not the best solution in all situations, and that significant implementation challenges remain.
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