The Lib Dem manifesto sets out how the party expects to raise £1 billion in revenue by legalising cannabis.
Key pledges include the offer of a second referendum to ensure the deal agreed with Brussels is put to voters, with one option being to remain in the European Union, and the desire to "fight a hard Brexit".
Liberal Democrats outlined that they would ban the sale of any new diesel vehicle or small auto in the United Kingdom by 2025, to reduce the harmful emissions which cause air pollution.
Local councils would decide how much to charge drivers.
The Liberal Democrats have announced bold plans, most controversially pledging to ban the sale of new diesel cars and small vans in just eight years by 2025.
The upcoming United Kingdom elections are unlikely to deliver enough certainty about what life will look like post-Brexit, said the former MEP and ALDE leader in an interview with EURACTIV.com, adding that no winners will emerge from the process.
May has vowed to press ahead with Brexit, saying she was prepared to take Britain out of the European Union even if no deal with the bloc could be struck, while Labour's leader Jeremy Corbyn has said the issue has been settled.
"The Liberal Democrats want you to have your choice over your future".
The Lib Dems pledge to hold a referendum on the final Brexit deal following two years of negotiations between London and Brussels. And if you don't like the deal you should be able to reject it and choose to remain in Europe.
And in an appeal to voters to support the Lib Dems, he said: "Theresa May and Nigel Farage's cold, mean-spirited Britain is not the Britain I love".
"This means leaving the single market, ending freedom of movement and abandoning the customs union - even though these choices will make the United Kingdom poorer and disappoint many leave voters who wanted a different outcome".More news: London City Airport's flights to be controlled from 70 miles away
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"Immigration is essential to our economy and a benefit to our society".
8 Waiting time standards for mental health to match physical health care. Extra funds for social care would be provided by means-testing pensioners' winter fuel payments and individuals would have a £100,000 protection against care costs.
The Lib Dems would spend an extra £7 billion on education, increasing school budgets and the pupil premium for disadvantaged children.
11 A fairer national funding formula.
13 Free childcare for all two-year-olds.
16 Eliminate deficit on day-to-day spending by 2020 to control the national debt, and then borrow only to invest. They would increase the earnings threshold for income tax to £12,500 and the higher rate to £50,000 by 2020.
A diesel scrappage scheme would also be introduced which would target the older and more polluting diesel cars banning them from the roads. They also want to extend low emission zones to 10 more towns and cities.
20 Zero-Carbon Britain Act with legally binding targets to cut greenhouse gas emissions by 80% by 2040 and to zero by 2050.
23 Require all front-line police to wear body cameras.
"The way forward is targeted surveillance on those who are suspected of serious crime or terrorism", he continued, not the indiscriminate collection of Britons' communications.
Labour has "lost the right to call themselves the opposition" by failing to make a stand on Brexit, Mr Farron said.
In the courts, the party pledged to clamp down on short prison sentences in favour of tough, non-custodial sentences, and to strengthen rights for victims. Labour voted with UKIP at Westminster to support hard Brexit.