By Kate Abnett BRUSSELS (Reuters) -European Parliament’s lead negotiator on an overhaul of Europe’s carbon market on Thursday said he was considering changes to rules that allow policymakers to intervene in the scheme if prices rise too fast. European Union carbon prices soared by around 150% last year and traded at a record 98.49 euros per tonne of CO2 earlier this week. “We have an unprecedented increase of the carbon price and still the mechanism in [Article 29a] that is designed to keep price shocks out of the system … it doesn’t work,” EU lawmaker Peter Liese told a parliamentary commit…