Meet Ampaire. This California-based start-up is one of the top 25 nominees of the Postcode Lottery Green Challenge 2018. Ampaire tackles two of the biggest problems in air travel: high operating costs and environmental impact. Two new aircraft are in development, and in the meantime, the 14-strong team is up-fitting existing vehicles with electrification technology, with a debut test flight scheduled for later this year. Here, co-founder and CEO, Kevin Noertker, discusses Ampaire’s pragmatic approach, and how reducing the aviation industry’s emissions has global implications.

Meet BioCarbon Engineering. This UK start-up is one of the top 25 finalists of the Postcode Lottery Green Challenge 2018. The company specialises in large-scale ecosystem restoration through a data-driven approach to reforestation. Using drone and satellite imagery to first map landscapes, they employ automated drones to shoot biodegradable seedpods into drylands, wetlands - and everything in between. CEO Susan Graham explains how our global net loss of trees calls for a scalable solution, and how BioCarbon Engineering is meeting that challenge.

Meet My Dream Home. This Cambodian start-up is one of the 25 nominees of the Postcode Lottery Green Challenge 2018. In the capital Phnom Penh, rural-urban migration sees millions seek opportunities for education and employment. But a lack of affordable housing sees tenants sharing the smallest of spaces, and families forced apart. Kongngy Hav, founder of My Dream Home, aims to solve Phnom Penh’s housing crisis, brick by brick: made from compressed earth, his interlocking ‘LEGO’ blocks are cheap to produce, easy to assemble and - for those struggling to get on the housing ladder - life-changing.

Meet Aislatum. This Mexican start-up is one of the 25 nominees of the Postcode Lottery Green Challenge 2018. Founded in 2013, Aislatum aims to reduce climate change by cooling cities. The start-up has developed a paste that, when applied to rooftops, reduces buildings’ internal temperatures by up to 12°C. After a series of pivots, Aislatum is currently developing its product into a transport-friendly powder, which not only blocks the sun, but also functions as a waterproof coating. Having treated some 50,000sqm of rooftops in Mexico, founder Simon Galico chatted to us about how he hopes to expand the business, and in doing so, reduce energy consumption.

Meet Banyan Nation. This recycling start-up, based in Hyderabad, India, is one of the 25 nominees of the Postcode Lottery Green Challenge 2018. As well as helping brands such as L'Oréal and Tata Motors reuse their plastic waste, the company has also established a data intelligence platform to track cities’ waste flow. Recognised by the World Economic Forum in 2018, Banyan Nation is currently building a second processing plant in India, opening in 2019, as well as the country’s first plastic testing facility. We spoke with co-founders Raj Madangopal and Mani Vajipey about how they’re changing the way brands think about recycled plastic in India.

In this series we want to highlight some of our scouting partners who have been of great value in finding the brightest start-up talents from all around the globe. Leading start-up hubs, accelerator programmes and entrepreneurship competitions have shared their enormous worldwide networks with us. In the second episode we focus on Good Tech Lab, a research initiative exploring the frontiers of technology, entrepreneurship and finance. We talked to co-founder Manuella Cunha Brito about the Lab’s research project and the aim to build a global green tech landscape that will create long-term impact.

We proudly present the 25 start-ups that are still in the running to win €500,000 in the Postcode Lottery Green Challenge 2018. These innovative businesses have been chosen by our preliminary jury out of 845 applications from 100 countries, and we are delighted to see entrepreneurs from all over the world making it into the top 25.

Jacquelien Bunt is deputy head of the Charities Department at the Dutch Postcode Lottery and is the new chair of the pre-jury of the Postcode Lottery Green Challenge. We talked to her about her background and her role in selecting the top 25 of the best ideas from over 845 submissions from all around the world.