Yes, a smart grid is a greener grid. Smart meters and intelligent grid can significantly benefit the environment by reducing consumption of fossil fuel resources, thereby reducing emission of greenhouse gases (GHG) and other air pollutants. Environmental benefits can be achieved in three ways:

1. Reducing electricity consumption and increasing transmission and distribution efficiency
   Studies suggest that given the ability to monitor their energy use more frequently in greater detail, many consumers may begin turning off unneeded appliances, change to more efficient lighting, adjust thermostats and make other energy-saving changes.  If consumers conserve energy, less power may need to be produced. Reduced emissions from potentially decreased power generation could translate into better air quality.
2. Reducing utility’s vehicular needs
   Smart meters will also reduce the consumption of resources and associated emission of greenhouse gases and other pollutants associated with performing basic utility services such as connections, disconnections, and meter readings, which can be conducted remotely for consumers with smart meters without sending out a truck. As of October 2010 for example, CenterPoint Energy has avoided over 300,000 "truck rolls" by completing service orders electronically.
3. Promoting distributed and renewable energy production and plug-in hybrid electric vehicles
   Finally, smart grid will create a platform that will promote the development and deployment of technologies for increasing distributed generation (DG) and energy storage capacity, such as wind and solar generation, and plug-in hybrid electric vehicles (PHEVs). Smart meters measure surplus electricity generated as well as electricity delivered, eliminating the need for installation of expensive specialized DG metering. Distributed generation can help reduce the need for new fossil-fuel-generated capacity and therefore benefit the environment. The smart grid will also include technologies that facilitate the use of PHEVs, thereby reducing the consumer’s reliance on gasoline and diesel-fueled vehicles.

No, it is illegal and unsafe to do so. Other than some limited exceptions the utility owns and maintains the metering equipment. This includes electric and gas meters used for measurement and billing, and other equipment such as transformers on the ground or on a pole.  Removing or tampering with the property creates a safety issue, which may result in termination of service, and is considered a crime. If done improperly it can result in serious injury or death. Licensed electricians must contact utilities when work requires a meter to be removed, reset, or the power cut or reconnected at a customer premise. 

Smart meters run on two frequencies. The frequency communicating to the electric meter is 900 MHz (megahertz). If the premise also has a gas meter, the frequency from the electric meter to the gas meter is 2.4 GHz (gigahertz).

The electric meter frequency is similar to a cell phone and the gas meter frequency is similar to a computer router. Neither device will interfere with any wireless devices in the home and it is highly unlikely that the relatively weak fields produced the meter would interfere with the operation of a medical device.