Just because demolition videos rock, today I'm bringing you the implosion of a 104-year-old bridge in Minneapolis.

American artist Mike Bouchet has proved why house building should be left to the professionals with his entry into the Venice Biennale of modern art (see video link below).

Private developers in Philadelphia are pushing ahead with plans to build a 460m skyscraper in the US city, despite the debilitating financial crisis.

Developers behind the American Commerce Centre say the iconic skyscraper - which would be among one of the tallest skyscrapers in the world - would employ thousands of builders and boost jobs when it opens in 2012.

Zoning changes have been passed to make way for the 63-storey tower and council officials claim funding for the project is on track.

Councillor Darrell Clarke told the Associated Press most of the money was coming from union pension funds and that the project had a 50/50 chance of going ahead.

"If they don't build it, then we're where we are currently with a vacant lot," he said.

The developers say the biggest hurdle is finding tenants for the project but that they hope to commence construction later this year.

This is the latest design in the war against environmental damage.

A group of engineers from Nectar in California have designed a skyscraper that it hopes will become a gigantic filter for the sky - undoing pollution generated by all the other skyscrapers.

Basically it holds about 200-400 large trees that absorb pollutants and converts CO2 into nice, clean and breathable oxygen.

It is made of concrete and includes a windmill powered water system that gives the trees the water and nutrients they need.

There are no plans for its construction yet, but its designers hope one day it will spring up near some of the world's worst polluting factories.

US president-elect Barack Obama is about to go on a construction spending spree, building new schools, bridges, roads and pipelines.

Unveiling his economic team, Obama announced he is spending his way out of the recession with a building bonaza worth up to £463bn.

The spendaholic president-elect hopes to create 2.5m jobs by 2011 with a public works programme that could rival the programme that dragged the US out of the Great Depression in the 1930s.

Although details have been scant so far, insiders say work could start within months.

CNN reports that some 3,000 projects costing £11.6bn could be under contract in less than 90 days. Many of these would be addressing a backlog of projects, such as bridge strengthening and road repaving.

Experts are also calling for the construction of new transport corridors that bundle together highways, high-speed rail, pipelines and utility lines.

Last month this blog ran a post on America's crumbling infrastructure and the 10 projects the US desperately needs.