Taoiseach Leo Varadkar has been strongly criticised by voters in his Dublin constituency over the Government decision not to raise carbon taxes in the Budget last October.

Correspondence to the Taoiseach in the days after the Budget show that he was warned the decision could prove costly.

These documents released under the Freedom of Information legislation see Mr Varadkar accused of putting Fine Gael's interests ahead of the needs of the world.

This accusation was contained in a dozen emails sent to the Taoiseach on this controversial topic.

One constituent even told him that he had shown a "lack of leadership and just plain weakness" before adding "we may all in time regret your decision".

Another said the Government had previously "caved in to militant water charge protesters" and had recently "bottled the decision to bring a carbon tax".

One writer warned that they would not vote for any member of the Government in the next election unless urgent action was taken to tackle climate change.

However, some political advice was also given to the Taoiseach in an email from one of his constituents in Dublin West.

They stated the "indignation" shown by the Green Party over the carbon tax decision could force them to support the minority administration in the future if it was looking vulnerable.

The logic implied here was that the Greens could not argue it was for the good of the planet if they shunned the opportunity to "get into Government to make things happen".

Just before Christmas the Taoiseach indicated that he would seek to get an all-party consensus over the next few weeks on how best to approach carbon tax increases.

Mr Varadkar views carbon tax as an environmental measure designed to change behaviour and not to raise revenue.

He hinted this could see the money raised redistributed to the public either through a direct payment or by increasing tax credits or welfare payments.