What are the main methods used by car manufacturers to reduce emissions in their ICE cars besides trying to lower the amount of fuel the engine uses?

Car manufacturers use several methods to reduce emissions in their I CE ( Internal Comb ust ion Engine ) cars , including : \n \n 1 . Impro ving engine efficiency : By improving the efficiency of the engine , manufacturers can reduce the amount of fuel needed to power the vehicle , which in turn reduces emissions . \n \n 2 . Using clean er fu els : Manufact urers can also reduce emissions by using clean er fu els , such as natural gas or bio fu els , which produce fewer emissions than traditional gas oline and dies el fu els . \n \n 3 . Implement ing emissions control technologies : Car manufacturers use various emissions control technologies , such as catal yt ic conver ters , to reduce the amount of harmful poll ut ants em itted from the engine . \n \n 4 . Red uc ing vehicle weight : By reducing the weight of the vehicle , manufacturers can reduce the amount of energy needed to move it , which in turn reduces emissions . \n \n 5 . Impro ving aer od ynamics : Impro ving the aer od ynamics of the vehicle can also reduce emissions by reducing the amount of energy needed to move it through the air . \n \n Over all , car manufacturers use a combination of these methods to reduce emissions in their I CE cars , and they are constantly working to develop new technologies and improve existing ones to make their vehicles more environment ally friendly . </s>