John F Wasik / Mumbai August 26, 2008, 3:48 IST My neighbour was palpably proud of himself when he mentioned at a backyard barbeque he had bought a specialised fund that invested in a solar-energy company. When he asked me what I thought of his well-intentioned investment, though, I had to play killjoy. Instead of patting him on the back, I told him it was a bad idea. While I sense that climate change is probably a man-made global problem that needs to be addressed by all of us, as investors we often pursue the wrong ideas. No doubt, there are dozens of ways to slice and dice the "green' sector. You can buy mutual funds that invest in broad alternative energy portfolios or narrow the field to only solar, water or clean-technology companies. All sound like great ideas on the surface. Many of the newest green funds have attracted a huge amount of investor interest as there's more than $171 billion in more than 170 socially and environmentally screened vehicles, according to Morningstar, the Chicago-based financial-information company. So much money has been invested in these stocks and funds that industry analysts are concerned that a bubble may be forming in some of these equities