A committee of cross-party politicians has warned the Conservative led British government’s Clean Growth Strategy to reduce greenhouse gas emissions will not be enough to meet legally binding climate change targets.

The strategy, launched last year, outlines investment in research and innovation to help reduce emissions, which lead to global warming.

Reuters Newsagency reports at the same time Prime Minister Theresa May’s government suffered its 15th defeat on legislation that will end Britain’s membership of the European Union when parliament’s upper chamber, the House of Lords, voted in favor of adding environmental safeguards to the bill.

Under the Clean Growth Strategy Britain has committed to cut emissions by 80 per cent by 2050 compared to 1990 levels and must produce proposals on how to reach its climate targets as part of carbon budgets set every five years.

Although the amount of electricity generated from low-carbon energy doubled to a record 50 per cent last year from 2009, there are signs that investment might have stalled in the past two years, the Environmental Audit Committee said in a report.

Reuters reports annual clean energy investment in Britain is now at its lowest level since 2008, threatening the country’s ability to meet its carbon budgets from 2023.

The report also said that changes to low-carbon energy policies in 2015 has undermined investor confidence and reduced the number of renewable energy projects in development.

Added to that, disruption from the privatisation of the Green Investment Bank, which was set up by the government in 2012 to spur private investment in green projects but sold to a consortium led by Australia’s Macquarie Bank last year, and a reduction in European Investment Bank lending following a vote to leave the EU might also have contributed to the dip in clean energy investment.

“The government must urgently plug this policy gap and publish its plan to secure the investment required to meet the UK’s climate change targets,” said Mary Creagh, chair of the Environmental Audit Committee.

“It should provide greater clarity on how it intends to deliver the Clean Growth Strategy by the 2018 Budget, and explore how a sovereign green bond could kickstart its Clean Growth Strategy,” she added.

Meanwhile the Prime Minister has to get the bill approved by both chambers of parliament well in advance of Britain’s exit on March 29, 2019, but the House of Lords, the unelected upper house, has demanded major changes that will force a showdown over coming weeks.

The Lords voted 294 to 244 in favour of a change to the bill that would force the government to maintain the EU’s environmental principles.

The government argues that Brexit will allow Britain to improve environmental protections through separate legislation.

Ms May’s Conservative government has already suffered high- profile defeats on core Brexit issues such as whether Britain should leave the EU’s single market and customs union.

Martin Callanan, a junior Brexit minister who is a member of the House of Lords, said the government had listened to constructive suggestions to improve the legislation which is now due to return to the House of Commons.

Reuters reports while the more powerful House of Commons can overturn the changes, they may embolden rebels in Ms May’s own party who favour a softer EU exit.

Ministers have accused the House of Lords, where the Conservatives do not have a majority, of making unnecessary changes and have indicated they will fight some of them back in the Commons.

That process will be a key test of Ms May’s ability to govern effectively and to deliver on her Brexit plans with just a slim working majority in the Commons, where she relies on the support of a small Northern Irish party.