The climate scientist estimate that sea-level rise could well be in the region of 1 to 2 metres by 2100,with a small risk of an even greater rise.could well be 中well是副词?作何意?

The climate scientist estimate that sea-level rise could well be in the region of 1 to 2 metres by 2100,with a small risk of an even greater rise.could well be 中well是副词?作何意?
The climate scientist estimate that sea-level rise could well be in the region of 1 to 2 metres by 2100,with a small risk of an even greater rise.
could well be 中well是副词?作何意?

The climate scientist estimate that sea-level rise could well be in the region of 1 to 2 metres by 2100,with a small risk of an even greater rise.could well be 中well是副词?作何意?
此处的well是副词,相当于possibly.气候专家估计,到2100年海平面有可能升高1-2米,升得更高的可能性不大（直译：不排除升得更高的风险,尽管这种风险不大）.

此处well是副词，连起来翻译是“极有可能”的意思。此处是作为程度的副词。

很的意思， Could well be 很可能