内容摘要：Gunmen on motorbikes pulled up alongside his car and sprayed it with bullets. Mr Cometa escaped uninjured but his bodyguard was hit.

Gunmen on motorbikes pulled up alongside his car and sprayed it with bullets. Mr Cometa escaped uninjured but his bodyguard was hit.

. "This is really impacting the ability of people to continue to earn their livelihoods," Ms Sachar says.She says that there are a number of low-tech ways to keep buildings cool, such as designing for air flow.

For outdoor workers, even a 20-minute break from the heat and humidity, such as in, can make a difference.But beyond this, active cooling will become increasingly critical as temperatures continue to rise due to climate change.

Morgan Stanley is predicting that the annual growth rate of the cooling market, already worth $235bn (£180bn) a year,Yet existing cooling devices have serious drawbacks. One issue the refrigerant - the fluid that transitions back and forth from liquid to gas, in a process that transfers heat.

It's common for them to leak from standard systems, harming both efficiency and potentially health.

The refrigerants typically used in cooling today are hydrofluorocarbons (HFCs), a group of synthetic gases with high global warming potential. HFCs are much more potent than carbon dioxide.At the other end of the spectrum are those that want to carve a niche out for themselves, rather than replace the incumbents.

In the last couple of years, a cottage industry of unique, new social apps has cropped.One of those is Mozi, created by Twitter co-founder Ev Williams. Mozi doesn't want you to socialise online at all.

Instead it informs you when you're going to be in the same place (city or event) as someone you know and encourages you to connect with people more often in person."Until Mozi, no combination of apps could tell me what city my friends are in at any given time, or even what my friends locally are up to," says Mozi co-founder, Molly DeWolf Swenson.