The Iranian nuclear program; and assimilation.
By and large modern Judaism and modern Christianity do not promote polygamy, but historically both did. In either case, the two religions are similar in this respect.
India and China
the first estate often faced revolts from the other two estates
There is no one unique message for the two sects and various movements of modern Judaism save for overbroad statements (like "do unto others as they would do unto you"). The essential message of Torah Judaism is: By following the will of God through the commandments given, every man can be a critical part of building world in accordance with that which is good and just. The essential message of Liberal Judaism is: An integrated approach, taking tradition and contemporary knowledge together can result in a morally upright lifestyle in the modern era.
China and India are two due to large populations and uncontrolled air and water pollution from industry.
The east coast megalopolis face two main serious problems. They currently are facing high density housing and high rise buildings.
Judaism and Christianity.
Judaism doesn't have 2 sides. It has many many aspects.
BP Oil Spill Nuclear technology
Two major cities in Israel are Jerusalem, which is the capital and considered a holy city for Judaism, Christianity, and Islam, and Tel Aviv, which is a vibrant modern city known for its beaches, nightlife, and cultural scene.
Where to begin? I think the two main problems are that they are too expensive and are still not very fuel efficient. Other problems include high use of resources, limited recyclability, pollution, over utilization of single occupant vehicles, etc.
Islam and Judaism are two distinct monotheistic religions that share part of their history.