We must face up to the long-term failures of Britain's approach to immigration and make the argument for an effective, compassionate and liberal alternative.

We need to invest in home-grown clean energy that will bring cheaper prices in the long run, shielding consumers from volatile international fossil fuel markets.

As a carer for my disabled son, I understand just how hard caring is, at the best of times. I know how important it is for families to get the support they need.

Climate change threatens serious economic disruption to us all with serious implications to global stability and the impact it will have on the whole of humanity.

I'm all in favour of talking to other parties, always have been, always will be. I'm a pluralist, talk to them, see what we've got in common, work together, fine.

The U.K. has been at the forefront of developing the climate change policy architecture that can ensure climate action is integrated into economic decision making.

A credible and effective response to climate change - which protects future generations from an unacceptable level of risk - needs the involvement of all countries.

The truth is, it was my Nanna and Grandad who helped me get over my mum's death. Surrounding me with infinite, unquestioning love, they were classic kinship carers.

Ed Miliband rails against energy companies and says the market isn't working. But wasn't he Britain's first secretary of state for energy and climate change in 2008?

We want the NHS to be able to recruit the doctors and nurses it needs. And we want British businesses to be free to hire the best workers from anywhere in the world.

I don't ever talk about red lines whether in coalition negotiations with other partners or in Europe. It is important that we listen to others and find a way forward.

What's most disappointing about May's failure on climate change is that Britain played such a pivotal role in securing international agreement on it in the first place.

British leadership in Europol has made the law-enforcement agency far more effective, and we have been influential in making human trafficking one of its top priorities.

For Liberal Democrats, the political choice between the hard Brexit menus offered by Boris Johnson and Jeremy Hunt might seem about as tempting as arsenic verses strychnine.

The reality is that no country's actions alone will create the impact required to limit global temperature rise to 2 degrees Celsius - we all need to be part of the solution.

We now have the economics confirming that not only is climate action required to reduce climate risks, but that it is vital to building long-term, sustainable economic growth.

One of the most exciting opportunities created by renewable energy technologies like solar is the ability to help the world's poorest develop faster - but more sustainably too.

There was a time before my O-levels when I remember thinking I used to study hard and work hard to please my mother, like most young children. And then I realised I'm doing this for me.

We have ensured through the 2013 Energy Act that low-carbon energy resources have a secure future in our energy mix. Wind, tidal, nuclear, biomass and CCS all have a major role to play.

In both world wars, Britain understood that our national sovereignty could only endure if we cooperated with other nations. That our fate is inexorably bound with that of our neighbours.

What I saw in my first year as secretary of state was a danger that if Britain didn't lead the way on climate change nothing would happen. I thought: If I don't lead, no one else is going to.

When we fight to uphold the rule of law, it's vital we uphold the rule of law as we fight. Otherwise we simply play into the hands of the terrorists and undermine our values and system of justice.

It's crucial we make the case for institutions like Nato and the E.U. as foundations for the peace and prosperity we have enjoyed for decades - and which too many people appear to take for granted.

No-deal Brexit could be Boris Johnson's biggest deception yet - worse than the Boris bus or the lies that had him sacked as a Times journalist or as a spokesman by the then Tory leader, Michael Howard.

I'm proud to have led the brokering of the ambitious 2030 climate package in the European Union to cut greenhouse gases by at least 40%, which puts the E.U. ahead of the global pack in terms of commitments.

When I fought the Tories over climate change and won, more than trebling renewable power with a new subsidy policy combining state intervention with competitive market forces, it was world-beatingly radical.

Whenever there's a big national event that brings the country together - whether it's the Olympics, a royal wedding or the 'Bake Off' final - there are inevitably a few contrarian voices speaking out against it.

By leading on a strong emissions reduction target, the U.K. is persuading others on the need for member states to have the freedom and flexibility to develop their own energy mix to achieve these ambitious reductions.

For me, the most ironic aspect of the Brexit debate has been right-wing Brexiteers speaking loftily about parliamentary sovereignty, when they have never backed MPs having a fuller involvement in how our country is run.

The union that is the United Kingdom has been extraordinarily successful. Our British family has cooperated brilliantly, working together with shared goals and values, to make a unique four-country multinational success.

You don't need to be a John Maynard Keynes to understand that if Britain leaves the European market, a border will have to be put in place - and that would break U.K. obligations in a treaty lodged at the United Nations.

Brexiteers often hark back to the blitz. Maybe they think the 'Britain standing alone' motif adds much-needed heroic purpose to a Brexit future in which Britain stands without trading partners or allies to tackle climate change.

Liberal Democrats are proud to be the main U.K. political party leading the Remain campaign. Being pro-E.U. is in our DNA: internationalism, tearing down walls rather than building them, is at the heart of who we are as a party.

Alongside energy efficiency, renewables and abatement, I believe safe nuclear power, with manageable waste, can play an important role in reducing greenhouse gas emissions, as long as it is cost competitive with other low carbon generation.

I am not a natural fan of Mr Tillerson's political instincts. Indeed, there maybe few things I would agree with Rex on: for example, he vouched his support for the war in Yemen, approved of Assad's regime, and has pushed for tax cuts for American big business.

Britain needs a diverse energy mix - home grown renewables, new nuclear, a switch from dirty coal to cleaner gas, and, when the technology is ready, carbon capture and storage. Diversity will keep the lights on and ensure we go green at the lowest possible cost.

The homeless often lose trust in people: in the hospital doctors, who had no choice but to discharge them back on to the streets, and in the family members from whom they have become estranged. Their past use of the NHS can make it difficult to patch together a full medical history.

Offshore oil and gas has proven to be a vital strategic resource for the United Kingdom. Not only has it contributed to Britain's energy security over decades, but it has supported hundreds of thousands of jobs across the country and contributed hundreds of billions of pounds in taxes to the economy.

When I was energy and climate change secretary I sat around a cabinet table with Gove, and he couldn't help playing to the Tory climate-sceptic audience. As education secretary, he tried to ban climate change from the geography curriculum. After an angry exchange of letters with me, he eventually backed down.

We have been developing an ever closer relationship with China on climate change for many years which has led to collaboration on carbon trading, offshore wind development, on low-carbon buildings, on nuclear energy, and on carbon capture and storage - to name just some of the ways in which we're working together.

If we can speed up the deployment of clean energy technologies in developing countries with investments from the Green Climate Fund, hundreds of millions of people will be able to access electricity for the first time - with all the education, health, communication and entrepreneurial opportunities electricity enables.

When I visited Jerusalem and the West Bank back in 2008, I was shocked by how individual Palestinians and whole Palestinian communities were treated by the Israeli government. From the illegal settlements to daily humiliations at checkpoints, the evidence of gross injustice and the human suffering it brings is indisputable.

From Nato to the U.N. and the E.U., the generation that lived through the first half of the 20th century knew they needed to create a new world order. An order with rules and institutions which, however imperfect, could act both as constraints on individual countries going rogue and as catalysts for co-operation for mutual benefit.

My experience as energy and climate change secretary - in the months I spent battling George Osborne over the budget for investment in low carbon, and in the daily attrition with Eric Pickles over onshore wind - was that many Conservatives simply regard their commitment to climate change action as something they had to say to get into power.

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