8 Largest US Pollution & Treatment Controls Corps Average Stock Prices Down 56% Due to Financial Meltdown Spillover Effects, Then Up 469% Under Obama and the US Fed

I found 8 US Pollution & Treatment Controls Corps with current Total Market Capitalizations of at least $100 mil each and which also had their common stocks trading on each of the following three dates: on December 31, 2007 during President Bush's second term, on March 6, 2009, very early in President Obama's first term, which was their lowest point due to the spillover effects resulting from the 2008 financial meltdown, and also on January 22, 2014.

In deriving these US Pollution & Treatment Controls Corps, I first started with the very helpful Yahoo Finance Website  Pollution & Treatment Controls Industry

The historical stock prices of these companies were obtained from the following two excellent internet resources....  Google Finance and MarketWatch Big Charts.

These 8 largest US Pollution & Treatment Controls Companies had their average stock prices drop by a huge 56% from December 31, 2007 during President Bush's second Presidential term, and very early in President Obama's first term on March 6, 2009, which was the very lowest point for the overall stock market due to the spillover effects resulting from the disastrous 2008 Financial Meltdown.

But since March 6, 2009, the average stock prices of these same 8 largest US Pollution & Treatment Controls Corps have increased by a very impressive 469% through January 22, 2014.
 
Clearly, the investors in and employees of these 8 US largest Pollution & Treatment Controls Companies must be very pleased with the impact of actions taken by both the Obama Administration and the US Fed to successfully rescue the US economy from its extremely weakened state caused by the 2008 US financial meltdown.
  
Below here are the market prices of each of these 8 largest US Pollution & Treatment Controls Companies on January 22, 2014, on March 6, 2009, and on December 31, 2007, sorted by Percentage Increase from March 6, 2009 to January 22, 2014:

						Market	Market
						Price	Price
						%	%
						Change	Change
			Market	Market	Market	3-6-09	12-31-07
			Price	Price	Price	to	to
Pollution & Treatment Controls	HQs		1-22-14	3-6-09	12-31-07	1-22-14	3-6-09
Advanced Emissions Solutions	Highland Ranch	CO	52.36	3.13	7.57	1573%	-59%
CECO Environmental	Cincinnati	OH	16.21	1.86	10.98	772%	-83%
Tennant Co	Minneapolis	MN	66.51	8.23	44.29	708%	-81%
Donaldson Co	Minneapolis	MN	42.40	11.31	23.19	275%	-51%
MFRI	Niles	IL	16.11	5.02	10.67	221%	-53%
CLARCOR	Franklin	TN	58.05	24.30	37.97	139%	-36%
Calgon Carbon	Pittsburgh	PA	20.58	13.31	15.89	55%	-16%
Fuel-Tech	Warrenville	IL	7.99	7.48	22.65	7%	-67%
Average % Change all 8						469%	-56%